---
title: "Social engineering - Glossary | MDN"
chunk: 2/3
source: "https://developer.mozilla.org/en-US/docs/Glossary/Social_engineering"
category: "reference"
tags: "web, html, css, javascript, documentation"
date_saved: "2026-05-05T05:45:41.099438+00:00"
instance: "kb-cron"
---

# Social engineering
In computer security, **social engineering** is a technique in which an attacker psychologically manipulates users into harmful actions, such as divulging their [credentials](https://developer.mozilla.org/en-US/docs/Glossary/Credential) or other sensitive information. For example, in a [phishing](https://developer.mozilla.org/en-US/docs/Web/Security/Attacks/Phishing) attack, the user thinks that they are signing into a site with which they have an account, when in reality they are giving their login details to a fake site controlled by the attacker. Social engineering attacks can be distinguished from other attacks because they do not target vulnerabilities in software or hardware, but target users, causing them to make bad decisions. This can make them hard to defend against, although system design choices can make them less likely to succeed or even effectively impossible. Defenses against social engineering attacks often focus on teaching users safe practices, such as not clicking links in emails. However, experience has shown that all users can be vulnerable to social engineering attacks especially when they are tired, busy, or stressed. ##  Help improve MDN 
[Learn how to contribute](https://developer.mozilla.org/en-US/docs/MDN/Community/Getting_started)
This page was last modified on Sep 19, 2025 by [MDN contributors](https://developer.mozilla.org/en-US/docs/Glossary/Social_engineering/contributors.txt). [View this page on GitHub](https://github.com/mdn/content/blob/main/files/en-us/glossary/social_engineering/index.md?plain=1 "Folder: en-us/glossary/social_engineering \(Opens in a new tab\)") • [Report a problem with this content](https://github.com/mdn/content/issues/new?template=page-report.yml&mdn-url=https%3A%2F%2Fdeveloper.mozilla.org%2Fen-US%2Fdocs%2FGlossary%2FSocial_engineering&metadata=%3C%21--+Do+not+make+changes+below+this+line+--%3E%0A%3Cdetails%3E%0A%3Csummary%3EPage+report+details%3C%2Fsummary%3E%0A%0A*+Folder%3A+%60en-us%2Fglossary%2Fsocial_engineering%60%0A*+MDN+URL%3A+https%3A%2F%2Fdeveloper.mozilla.org%2Fen-US%2Fdocs%2FGlossary%2FSocial_engineering%0A*+GitHub+URL%3A+https%3A%2F%2Fgithub.com%2Fmdn%2Fcontent%2Fblob%2Fmain%2Ffiles%2Fen-us%2Fglossary%2Fsocial_engineering%2Findex.md%0A*+Last+commit%3A+https%3A%2F%2Fgithub.com%2Fmdn%2Fcontent%2Fcommit%2F5e3308146f872a133a3221e612ea8c6ee85dd77d%0A*+Document+last+modified%3A+2025-09-19T15%3A23%3A25.000Z%0A%0A%3C%2Fdetails%3E "This will take you to GitHub to file a new issue.")
  1. [Glossary](https://developer.mozilla.org/en-US/docs/Glossary)
  2. 1. [Abstraction](https://developer.mozilla.org/en-US/docs/Glossary/Abstraction)
    2. [Accent](https://developer.mozilla.org/en-US/docs/Glossary/Accent)
    3. [Accessibility](https://developer.mozilla.org/en-US/docs/Glossary/Accessibility)
    4. [Accessibility tree](https://developer.mozilla.org/en-US/docs/Glossary/Accessibility_tree)
    5. [Accessible description](https://developer.mozilla.org/en-US/docs/Glossary/Accessible_description)
    6. [Accessible name](https://developer.mozilla.org/en-US/docs/Glossary/Accessible_name)
    7. [Adobe Flash](https://developer.mozilla.org/en-US/docs/Glossary/Adobe_Flash)
    8. [Advance measure](https://developer.mozilla.org/en-US/docs/Glossary/Advance_measure)
    9. [Ajax](https://developer.mozilla.org/en-US/docs/Glossary/AJAX)
    10. [Algorithm](https://developer.mozilla.org/en-US/docs/Glossary/Algorithm)
    11. [Alignment container](https://developer.mozilla.org/en-US/docs/Glossary/Alignment_Container)
    12. [Alignment subject](https://developer.mozilla.org/en-US/docs/Glossary/Alignment_Subject)
    13. [Alpha (alpha channel)](https://developer.mozilla.org/en-US/docs/Glossary/Alpha)
    14. [ALPN](https://developer.mozilla.org/en-US/docs/Glossary/ALPN)
    15. [API](https://developer.mozilla.org/en-US/docs/Glossary/API)
    16. [Apple Safari](https://developer.mozilla.org/en-US/docs/Glossary/Apple_Safari)
    17. [Application context](https://developer.mozilla.org/en-US/docs/Glossary/Application_context)
    18. [Argument](https://developer.mozilla.org/en-US/docs/Glossary/Argument)
    19. [ARIA](https://developer.mozilla.org/en-US/docs/Glossary/ARIA)
    20. [ARPA](https://developer.mozilla.org/en-US/docs/Glossary/ARPA)
    21. [ARPANET](https://developer.mozilla.org/en-US/docs/Glossary/Arpanet)
    22. [Array](https://developer.mozilla.org/en-US/docs/Glossary/Array)
    23. [ASCII](https://developer.mozilla.org/en-US/docs/Glossary/ASCII)
    24. [Aspect ratio](https://developer.mozilla.org/en-US/docs/Glossary/Aspect_ratio)
    25. [Asynchronous](https://developer.mozilla.org/en-US/docs/Glossary/Asynchronous)
    26. [ATAG](https://developer.mozilla.org/en-US/docs/Glossary/ATAG)
    27. [Attribute](https://developer.mozilla.org/en-US/docs/Glossary/Attribute)
    28. [Authentication](https://developer.mozilla.org/en-US/docs/Glossary/Authentication)
    29. [Authenticator](https://developer.mozilla.org/en-US/docs/Glossary/Authenticator)
    30. [Bandwidth](https://developer.mozilla.org/en-US/docs/Glossary/Bandwidth)
    31. [Base64](https://developer.mozilla.org/en-US/docs/Glossary/Base64)
    32. [Baseline](https://developer.mozilla.org/en-US/docs/Glossary/Baseline)
      1. [Baseline (compatibility)](https://developer.mozilla.org/en-US/docs/Glossary/Baseline/Compatibility)
      2. [Baseline (typography)](https://developer.mozilla.org/en-US/docs/Glossary/Baseline/Typography)
    33. [BCP 47 language tag](https://developer.mozilla.org/en-US/docs/Glossary/BCP_47_language_tag)
    34. [Beacon](https://developer.mozilla.org/en-US/docs/Glossary/Beacon)
    35. [Bézier curve](https://developer.mozilla.org/en-US/docs/Glossary/Bezier_curve)
    36. [bfcache](https://developer.mozilla.org/en-US/docs/Glossary/bfcache)
    37. [BiDi](https://developer.mozilla.org/en-US/docs/Glossary/BiDi)
    38. [BigInt](https://developer.mozilla.org/en-US/docs/Glossary/BigInt)
    39. [Binding](https://developer.mozilla.org/en-US/docs/Glossary/Binding)
    40. [Bitwise flags](https://developer.mozilla.org/en-US/docs/Glossary/Bitwise_flags)
    41. [Blink](https://developer.mozilla.org/en-US/docs/Glossary/Blink)
    42. [blink element (<blink> tag)](https://developer.mozilla.org/en-US/docs/Glossary/blink_element)
    43. [Block](https://developer.mozilla.org/en-US/docs/Glossary/Block)
      1. [Block (CSS)](https://developer.mozilla.org/en-US/docs/Glossary/Block/CSS)
      2. [Block (scripting)](https://developer.mozilla.org/en-US/docs/Glossary/Block/Scripting)
    44. [Block cipher mode of operation](https://developer.mozilla.org/en-US/docs/Glossary/Block_cipher_mode_of_operation)
    45. [Block-level content](https://developer.mozilla.org/en-US/docs/Glossary/Block-level_content)
    46. [Boolean](https://developer.mozilla.org/en-US/docs/Glossary/Boolean)
      1. [Boolean (JavaScript)](https://developer.mozilla.org/en-US/docs/Glossary/Boolean/JavaScript)
      2. [Boolean attribute (ARIA)](https://developer.mozilla.org/en-US/docs/Glossary/Boolean/ARIA)
      3. [Boolean attribute (HTML)](https://developer.mozilla.org/en-US/docs/Glossary/Boolean/HTML)
    47. [Bounding box](https://developer.mozilla.org/en-US/docs/Glossary/Bounding_box)
    48. [Breadcrumb](https://developer.mozilla.org/en-US/docs/Glossary/Breadcrumb)
    49. [Brotli compression](https://developer.mozilla.org/en-US/docs/Glossary/Brotli_compression)
    50. [Browser](https://developer.mozilla.org/en-US/docs/Glossary/Browser)
    51. [Browsing context](https://developer.mozilla.org/en-US/docs/Glossary/Browsing_context)
    52. [Buffer](https://developer.mozilla.org/en-US/docs/Glossary/Buffer)
    53. [Bun](https://developer.mozilla.org/en-US/docs/Glossary/Bun)
    54. [Cache](https://developer.mozilla.org/en-US/docs/Glossary/Cache)
    55. [Cacheable](https://developer.mozilla.org/en-US/docs/Glossary/Cacheable)
    56. [CalDAV](https://developer.mozilla.org/en-US/docs/Glossary/CalDAV)
    57. [Call stack](https://developer.mozilla.org/en-US/docs/Glossary/Call_stack)
    58. [Callback function](https://developer.mozilla.org/en-US/docs/Glossary/Callback_function)
    59. [Camel case](https://developer.mozilla.org/en-US/docs/Glossary/Camel_case)
    60. [Canonical order](https://developer.mozilla.org/en-US/docs/Glossary/Canonical_order)
    61. [Canvas](https://developer.mozilla.org/en-US/docs/Glossary/Canvas)
    62. [Card sorting](https://developer.mozilla.org/en-US/docs/Glossary/Card_sorting)
    63. [CardDAV](https://developer.mozilla.org/en-US/docs/Glossary/CardDAV)
    64. [Caret](https://developer.mozilla.org/en-US/docs/Glossary/Caret)
    65. [CDN](https://developer.mozilla.org/en-US/docs/Glossary/CDN)
    66. [Certificate authority](https://developer.mozilla.org/en-US/docs/Glossary/Certificate_authority)
    67. [Certified](https://developer.mozilla.org/en-US/docs/Glossary/Certified)
    68. [Challenge-response authentication](https://developer.mozilla.org/en-US/docs/Glossary/Challenge)
    69. [Character](https://developer.mozilla.org/en-US/docs/Glossary/Character)
    70. [Character encoding](https://developer.mozilla.org/en-US/docs/Glossary/Character_encoding)
    71. [Character reference](https://developer.mozilla.org/en-US/docs/Glossary/Character_reference)
    72. [Character set](https://developer.mozilla.org/en-US/docs/Glossary/Character_set)
    73. [Chrome](https://developer.mozilla.org/en-US/docs/Glossary/Chrome)
    74. [CIA](https://developer.mozilla.org/en-US/docs/Glossary/CIA)
    75. [Cipher](https://developer.mozilla.org/en-US/docs/Glossary/Cipher)
    76. [Cipher suite](https://developer.mozilla.org/en-US/docs/Glossary/Cipher_suite)
    77. [Ciphertext](https://developer.mozilla.org/en-US/docs/Glossary/Ciphertext)
    78. [Class](https://developer.mozilla.org/en-US/docs/Glossary/Class)
    79. [Client-side rendering (CSR)](https://developer.mozilla.org/en-US/docs/Glossary/CSR)
    80. [Closure](https://developer.mozilla.org/en-US/docs/Glossary/Closure)
    81. [Cloud](https://developer.mozilla.org/en-US/docs/Glossary/Cloud)
    82. [Cloud computing](https://developer.mozilla.org/en-US/docs/Glossary/Cloud_computing)
    83. [CMS](https://developer.mozilla.org/en-US/docs/Glossary/CMS)
    84. [Code point](https://developer.mozilla.org/en-US/docs/Glossary/Code_point)
    85. [Code splitting](https://developer.mozilla.org/en-US/docs/Glossary/Code_splitting)
    86. [Code unit](https://developer.mozilla.org/en-US/docs/Glossary/Code_unit)
    87. [Codec](https://developer.mozilla.org/en-US/docs/Glossary/Codec)
    88. [Color space](https://developer.mozilla.org/en-US/docs/Glossary/Color_space)
    89. [Color wheel](https://developer.mozilla.org/en-US/docs/Glossary/Color_wheel)
    90. [Compile](https://developer.mozilla.org/en-US/docs/Glossary/Compile)
    91. [Compile time](https://developer.mozilla.org/en-US/docs/Glossary/Compile_time)
    92. [Composite operation](https://developer.mozilla.org/en-US/docs/Glossary/Composite_operation)
    93. [Compression Dictionary Transport](https://developer.mozilla.org/en-US/docs/Glossary/Compression_dictionary_transport)
    94. [Computer programming](https://developer.mozilla.org/en-US/docs/Glossary/Computer_Programming)
    95. [Conditional](https://developer.mozilla.org/en-US/docs/Glossary/Conditional)
    96. [Constant](https://developer.mozilla.org/en-US/docs/Glossary/Constant)
    97. [Constructor](https://developer.mozilla.org/en-US/docs/Glossary/Constructor)
    98. [Content header](https://developer.mozilla.org/en-US/docs/Glossary/Content_header)
    99. [Continuous integration](https://developer.mozilla.org/en-US/docs/Glossary/Continuous_integration)
    100. [Continuous media](https://developer.mozilla.org/en-US/docs/Glossary/Continuous_Media)
    101. [Control flow](https://developer.mozilla.org/en-US/docs/Glossary/Control_flow)
    102. [Cookie](https://developer.mozilla.org/en-US/docs/Glossary/Cookie)
    103. [Copyleft](https://developer.mozilla.org/en-US/docs/Glossary/Copyleft)
    104. [CORS](https://developer.mozilla.org/en-US/docs/Glossary/CORS)
    105. [CORS-safelisted request header](https://developer.mozilla.org/en-US/docs/Glossary/CORS-safelisted_request_header)
    106. [CORS-safelisted response header](https://developer.mozilla.org/en-US/docs/Glossary/CORS-safelisted_response_header)
    107. [Crawler](https://developer.mozilla.org/en-US/docs/Glossary/Crawler)
    108. [Credential](https://developer.mozilla.org/en-US/docs/Glossary/Credential)
    109. [CRLF](https://developer.mozilla.org/en-US/docs/Glossary/CRLF)
    110. [Cross Axis](https://developer.mozilla.org/en-US/docs/Glossary/Cross_Axis)
    111. [Cross-site request forgery (CSRF)](https://developer.mozilla.org/en-US/docs/Glossary/CSRF)
    112. [Cross-site scripting (XSS)](https://developer.mozilla.org/en-US/docs/Glossary/Cross-site_scripting)
    113. [CRUD](https://developer.mozilla.org/en-US/docs/Glossary/CRUD)
    114. [Cryptanalysis](https://developer.mozilla.org/en-US/docs/Glossary/Cryptanalysis)
    115. [Cryptography](https://developer.mozilla.org/en-US/docs/Glossary/Cryptography)
    116. [CSP](https://developer.mozilla.org/en-US/docs/Glossary/CSP)
    117. [CSS](https://developer.mozilla.org/en-US/docs/Glossary/CSS)
    118. [CSS Object Model (CSSOM)](https://developer.mozilla.org/en-US/docs/Glossary/CSSOM)
    119. [CSS pixel](https://developer.mozilla.org/en-US/docs/Glossary/CSS_pixel)
    120. [CSS preprocessor](https://developer.mozilla.org/en-US/docs/Glossary/CSS_preprocessor)
    121. [Cumulative Layout Shift (CLS)](https://developer.mozilla.org/en-US/docs/Glossary/CLS)
    122. [Data structure](https://developer.mozilla.org/en-US/docs/Glossary/Data_structure)
    123. [Database](https://developer.mozilla.org/en-US/docs/Glossary/Database)
    124. [Debounce](https://developer.mozilla.org/en-US/docs/Glossary/Debounce)
    125. [Decryption](https://developer.mozilla.org/en-US/docs/Glossary/Decryption)
    126. [Deep copy](https://developer.mozilla.org/en-US/docs/Glossary/Deep_copy)
    127. [Delta](https://developer.mozilla.org/en-US/docs/Glossary/Delta)
    128. [Denial of Service (DoS)](https://developer.mozilla.org/en-US/docs/Glossary/Denial_of_Service)
    129. [Deno](https://developer.mozilla.org/en-US/docs/Glossary/Deno)
    130. [Descriptor (CSS)](https://developer.mozilla.org/en-US/docs/Glossary/CSS_Descriptor)
    131. [Deserialization](https://developer.mozilla.org/en-US/docs/Glossary/Deserialization)
    132. [Developer tools](https://developer.mozilla.org/en-US/docs/Glossary/Developer_Tools)
    133. [Device pixel](https://developer.mozilla.org/en-US/docs/Glossary/Device_pixel)
    134. [Digital certificate](https://developer.mozilla.org/en-US/docs/Glossary/Digital_certificate)
    135. [Digital signature](https://developer.mozilla.org/en-US/docs/Glossary/Digital_signature)
    136. [Distributed Denial of Service (DDoS)](https://developer.mozilla.org/en-US/docs/Glossary/Distributed_Denial_of_Service)
    137. [DMZ](https://developer.mozilla.org/en-US/docs/Glossary/DMZ)
    138. [DNS](https://developer.mozilla.org/en-US/docs/Glossary/DNS)
    139. [Doctype](https://developer.mozilla.org/en-US/docs/Glossary/Doctype)
    140. [Document directive](https://developer.mozilla.org/en-US/docs/Glossary/Document_directive)
    141. [Document environment](https://developer.mozilla.org/en-US/docs/Glossary/Document_environment)
    142. [DOM (Document Object Model)](https://developer.mozilla.org/en-US/docs/Glossary/DOM)
    143. [Domain](https://developer.mozilla.org/en-US/docs/Glossary/Domain)
    144. [Domain name](https://developer.mozilla.org/en-US/docs/Glossary/Domain_name)
    145. [Domain sharding](https://developer.mozilla.org/en-US/docs/Glossary/Domain_sharding)
    146. [Dominator](https://developer.mozilla.org/en-US/docs/Glossary/Dominator)
    147. [DSL](https://developer.mozilla.org/en-US/docs/Glossary/DSL)
      1. [DSL (Digital Subscriber Line)](https://developer.mozilla.org/en-US/docs/Glossary/DSL/Digital_subscriber_line)
      2. [DSL (Domain-Specific Language)](https://developer.mozilla.org/en-US/docs/Glossary/DSL/Domain_specific_language)
    148. [DTLS (Datagram Transport Layer Security)](https://developer.mozilla.org/en-US/docs/Glossary/DTLS)
    149. [DTMF (Dual-Tone Multi-Frequency signaling)](https://developer.mozilla.org/en-US/docs/Glossary/DTMF)
    150. [Dynamic typing](https://developer.mozilla.org/en-US/docs/Glossary/Dynamic_typing)
    151. [ECMA](https://developer.mozilla.org/en-US/docs/Glossary/ECMA)
    152. [ECMAScript](https://developer.mozilla.org/en-US/docs/Glossary/ECMAScript)
    153. [Effective connection type](https://developer.mozilla.org/en-US/docs/Glossary/Effective_connection_type)
    154. [Element](https://developer.mozilla.org/en-US/docs/Glossary/Element)
    155. [Encapsulation](https://developer.mozilla.org/en-US/docs/Glossary/Encapsulation)
    156. [Encryption](https://developer.mozilla.org/en-US/docs/Glossary/Encryption)
    157. [Endianness](https://developer.mozilla.org/en-US/docs/Glossary/Endianness)
    158. [Engine](https://developer.mozilla.org/en-US/docs/Glossary/Engine)
      1. [JavaScript engine](https://developer.mozilla.org/en-US/docs/Glossary/Engine/JavaScript)
      2. [Rendering engine](https://developer.mozilla.org/en-US/docs/Glossary/Engine/Rendering)
    159. [Entity](https://developer.mozilla.org/en-US/docs/Glossary/Entity)
    160. [Entity header](https://developer.mozilla.org/en-US/docs/Glossary/Entity_header)
    161. [Enumerated](https://developer.mozilla.org/en-US/docs/Glossary/Enumerated)
    162. [Escape character](https://developer.mozilla.org/en-US/docs/Glossary/Escape_character)
    163. [Event](https://developer.mozilla.org/en-US/docs/Glossary/Event)
    164. [Exception](https://developer.mozilla.org/en-US/docs/Glossary/Exception)
    165. [EXIF](https://developer.mozilla.org/en-US/docs/Glossary/EXIF)
    166. [Expando](https://developer.mozilla.org/en-US/docs/Glossary/Expando)
    167. [Extrinsic size](https://developer.mozilla.org/en-US/docs/Glossary/Extrinsic_size)
    168. [Fallback alignment](https://developer.mozilla.org/en-US/docs/Glossary/Fallback_Alignment)
    169. [Falsy](https://developer.mozilla.org/en-US/docs/Glossary/Falsy)
    170. [Favicon](https://developer.mozilla.org/en-US/docs/Glossary/Favicon)
    171. [Federated identity](https://developer.mozilla.org/en-US/docs/Glossary/Federated_identity)
    172. [Fetch directive](https://developer.mozilla.org/en-US/docs/Glossary/Fetch_directive)
    173. [Fetch metadata request header](https://developer.mozilla.org/en-US/docs/Glossary/Fetch_metadata_request_header)
    174. [Fingerprinting](https://developer.mozilla.org/en-US/docs/Glossary/Fingerprinting)
    175. [Firefox OS](https://developer.mozilla.org/en-US/docs/Glossary/Firefox_OS)
    176. [Firewall](https://developer.mozilla.org/en-US/docs/Glossary/Firewall)
    177. [First Contentful Paint (FCP)](https://developer.mozilla.org/en-US/docs/Glossary/First_contentful_paint)
    178. [First CPU idle](https://developer.mozilla.org/en-US/docs/Glossary/First_CPU_idle)
    179. [First Input Delay (FID)](https://developer.mozilla.org/en-US/docs/Glossary/First_input_delay)
    180. [First Meaningful Paint (FMP)](https://developer.mozilla.org/en-US/docs/Glossary/First_meaningful_paint)
    181. [First Paint (FP)](https://developer.mozilla.org/en-US/docs/Glossary/First_paint)
    182. [First-class function](https://developer.mozilla.org/en-US/docs/Glossary/First-class_Function)
    183. [Flex](https://developer.mozilla.org/en-US/docs/Glossary/Flex)
    184. [Flex container](https://developer.mozilla.org/en-US/docs/Glossary/Flex_Container)
    185. [Flex item](https://developer.mozilla.org/en-US/docs/Glossary/Flex_Item)
    186. [Flexbox](https://developer.mozilla.org/en-US/docs/Glossary/Flexbox)
    187. [Flow relative values](https://developer.mozilla.org/en-US/docs/Glossary/Flow_relative_values)
    188. [Forbidden request header](https://developer.mozilla.org/en-US/docs/Glossary/Forbidden_request_header)
    189. [Forbidden response header name](https://developer.mozilla.org/en-US/docs/Glossary/Forbidden_response_header_name)
    190. [Fork](https://developer.mozilla.org/en-US/docs/Glossary/Fork)
    191. [Fragmentainer](https://developer.mozilla.org/en-US/docs/Glossary/Fragmentainer)
    192. [Frame rate (FPS)](https://developer.mozilla.org/en-US/docs/Glossary/FPS)
    193. [FTP](https://developer.mozilla.org/en-US/docs/Glossary/FTP)
    194. [FTU](https://developer.mozilla.org/en-US/docs/Glossary/FTU)
    195. [Function](https://developer.mozilla.org/en-US/docs/Glossary/Function)
    196. [Fuzz testing](https://developer.mozilla.org/en-US/docs/Glossary/Fuzzing)
    197. [Gamut](https://developer.mozilla.org/en-US/docs/Glossary/Gamut)
    198. [Garbage collection](https://developer.mozilla.org/en-US/docs/Glossary/Garbage_collection)
    199. [Gecko](https://developer.mozilla.org/en-US/docs/Glossary/Gecko)
    200. [General header](https://developer.mozilla.org/en-US/docs/Glossary/General_header)
    201. [GIF](https://developer.mozilla.org/en-US/docs/Glossary/GIF)
    202. [Git](https://developer.mozilla.org/en-US/docs/Glossary/Git)
    203. [Global object](https://developer.mozilla.org/en-US/docs/Glossary/Global_object)
    204. [Global scope](https://developer.mozilla.org/en-US/docs/Glossary/Global_scope)
    205. [Global variable](https://developer.mozilla.org/en-US/docs/Glossary/Global_variable)
    206. [Glyph](https://developer.mozilla.org/en-US/docs/Glossary/Glyph)
    207. [Google Chrome](https://developer.mozilla.org/en-US/docs/Glossary/Google_Chrome)
    208. [GPL](https://developer.mozilla.org/en-US/docs/Glossary/GPL)
    209. [GPU](https://developer.mozilla.org/en-US/docs/Glossary/GPU)
    210. [Graceful degradation](https://developer.mozilla.org/en-US/docs/Glossary/Graceful_degradation)
    211. [Grid](https://developer.mozilla.org/en-US/docs/Glossary/Grid)
    212. [Grid areas](https://developer.mozilla.org/en-US/docs/Glossary/Grid_Areas)
    213. [Grid Axis](https://developer.mozilla.org/en-US/docs/Glossary/Grid_Axis)
    214. [Grid Cell](https://developer.mozilla.org/en-US/docs/Glossary/Grid_Cell)
    215. [Grid Column](https://developer.mozilla.org/en-US/docs/Glossary/Grid_Column)
    216. [Grid container](https://developer.mozilla.org/en-US/docs/Glossary/Grid_Container)
    217. [Grid lines](https://developer.mozilla.org/en-US/docs/Glossary/Grid_Lines)
    218. [Grid Row](https://developer.mozilla.org/en-US/docs/Glossary/Grid_Row)
    219. [Grid Tracks](https://developer.mozilla.org/en-US/docs/Glossary/Grid_Tracks)
    220. [Guaranteed-invalid value](https://developer.mozilla.org/en-US/docs/Glossary/guaranteed_invalid_value)
    221. [Gutters](https://developer.mozilla.org/en-US/docs/Glossary/Gutters)
    222. [gzip compression](https://developer.mozilla.org/en-US/docs/Glossary/gzip_compression)
    223. [Hash function](https://developer.mozilla.org/en-US/docs/Glossary/Hash_function)
    224. [Hash routing](https://developer.mozilla.org/en-US/docs/Glossary/Hash_routing)
    225. [Head](https://developer.mozilla.org/en-US/docs/Glossary/Head)
    226. [High-level programming language](https://developer.mozilla.org/en-US/docs/Glossary/High-level_programming_language)
    227. [HMAC](https://developer.mozilla.org/en-US/docs/Glossary/HMAC)
    228. [Hoisting](https://developer.mozilla.org/en-US/docs/Glossary/Hoisting)
    229. [HOL blocking](https://developer.mozilla.org/en-US/docs/Glossary/Head_of_line_blocking)
    230. [Host](https://developer.mozilla.org/en-US/docs/Glossary/Host)
    231. [Hotlink](https://developer.mozilla.org/en-US/docs/Glossary/Hotlink)
    232. [Houdini](https://developer.mozilla.org/en-US/docs/Glossary/Houdini)
    233. [HPKP](https://developer.mozilla.org/en-US/docs/Glossary/HPKP)
    234. [HSTS](https://developer.mozilla.org/en-US/docs/Glossary/HSTS)
    235. [HTML](https://developer.mozilla.org/en-US/docs/Glossary/HTML)
    236. [HTML color codes](https://developer.mozilla.org/en-US/docs/Glossary/html_color_codes)
    237. [HTML5](https://developer.mozilla.org/en-US/docs/Glossary/HTML5)
    238. [HTTP](https://developer.mozilla.org/en-US/docs/Glossary/HTTP)
    239. [HTTP content](https://developer.mozilla.org/en-US/docs/Glossary/HTTP_Content)
    240. [HTTP header](https://developer.mozilla.org/en-US/docs/Glossary/HTTP_header)
    241. [HTTP/2](https://developer.mozilla.org/en-US/docs/Glossary/HTTP_2)
    242. [HTTP/3](https://developer.mozilla.org/en-US/docs/Glossary/HTTP_3)
    243. [HTTPS](https://developer.mozilla.org/en-US/docs/Glossary/HTTPS)
    244. [HTTPS RR](https://developer.mozilla.org/en-US/docs/Glossary/HTTPS_RR)
    245. [Hyperlink](https://developer.mozilla.org/en-US/docs/Glossary/Hyperlink)
    246. [Hypertext](https://developer.mozilla.org/en-US/docs/Glossary/Hypertext)
    247. [IANA](https://developer.mozilla.org/en-US/docs/Glossary/IANA)
    248. [ICANN](https://developer.mozilla.org/en-US/docs/Glossary/ICANN)
    249. [ICE](https://developer.mozilla.org/en-US/docs/Glossary/ICE)
    250. [IDE](https://developer.mozilla.org/en-US/docs/Glossary/IDE)
    251. [Idempotent](https://developer.mozilla.org/en-US/docs/Glossary/Idempotent)
    252. [Identifier](https://developer.mozilla.org/en-US/docs/Glossary/Identifier)
    253. [Identity provider (IdP)](https://developer.mozilla.org/en-US/docs/Glossary/Identity_provider)
    254. [IDL](https://developer.mozilla.org/en-US/docs/Glossary/IDL)
    255. [IETF](https://developer.mozilla.org/en-US/docs/Glossary/IETF)
    256. [IIFE](https://developer.mozilla.org/en-US/docs/Glossary/IIFE)
    257. [IMAP](https://developer.mozilla.org/en-US/docs/Glossary/IMAP)
    258. [Immutable](https://developer.mozilla.org/en-US/docs/Glossary/Immutable)
    259. [IndexedDB](https://developer.mozilla.org/en-US/docs/Glossary/IndexedDB)
    260. [Information architecture](https://developer.mozilla.org/en-US/docs/Glossary/Information_architecture)
    261. [Inheritance](https://developer.mozilla.org/en-US/docs/Glossary/Inheritance)
    262. [Ink overflow](https://developer.mozilla.org/en-US/docs/Glossary/Ink_overflow)
    263. [Inline-level content](https://developer.mozilla.org/en-US/docs/Glossary/Inline-level_content)
    264. [Input method editor](https://developer.mozilla.org/en-US/docs/Glossary/Input_method_editor)
    265. [Inset properties](https://developer.mozilla.org/en-US/docs/Glossary/Inset_properties)
    266. [Instance](https://developer.mozilla.org/en-US/docs/Glossary/Instance)
    267. [Interaction to Next Paint (INP)](https://developer.mozilla.org/en-US/docs/Glossary/Interaction_to_next_paint)
    268. [Internationalization (i18n)](https://developer.mozilla.org/en-US/docs/Glossary/Internationalization)
    269. [Internet](https://developer.mozilla.org/en-US/docs/Glossary/Internet)
    270. [Interpolation](https://developer.mozilla.org/en-US/docs/Glossary/Interpolation)
    271. [Intrinsic size](https://developer.mozilla.org/en-US/docs/Glossary/Intrinsic_Size)
    272. [Invariant](https://developer.mozilla.org/en-US/docs/Glossary/Invariant)
    273. [IP Address](https://developer.mozilla.org/en-US/docs/Glossary/IP_Address)
    274. [IPv4](https://developer.mozilla.org/en-US/docs/Glossary/IPv4)
    275. [IPv6](https://developer.mozilla.org/en-US/docs/Glossary/IPv6)
    276. [IRC](https://developer.mozilla.org/en-US/docs/Glossary/IRC)
    277. [ISO](https://developer.mozilla.org/en-US/docs/Glossary/ISO)
    278. [ISP](https://developer.mozilla.org/en-US/docs/Glossary/ISP)
    279. [ITU](https://developer.mozilla.org/en-US/docs/Glossary/ITU)
    280. [Jank](https://developer.mozilla.org/en-US/docs/Glossary/Jank)
    281. [Java](https://developer.mozilla.org/en-US/docs/Glossary/Java)
    282. [JavaScript](https://developer.mozilla.org/en-US/docs/Glossary/JavaScript)
    283. [Jitter](https://developer.mozilla.org/en-US/docs/Glossary/Jitter)
    284. [JPEG](https://developer.mozilla.org/en-US/docs/Glossary/JPEG)
    285. [JSON](https://developer.mozilla.org/en-US/docs/Glossary/JSON)
    286. [JSON type representation](https://developer.mozilla.org/en-US/docs/Glossary/JSON_type_representation)
    287. [Just-In-Time Compilation (JIT)](https://developer.mozilla.org/en-US/docs/Glossary/Just_In_Time_Compilation)
    288. [Kebab case](https://developer.mozilla.org/en-US/docs/Glossary/Kebab_case)
    289. [Key](https://developer.mozilla.org/en-US/docs/Glossary/Key)
    290. [Keyword](https://developer.mozilla.org/en-US/docs/Glossary/Keyword)
    291. [Largest Contentful Paint (LCP)](https://developer.mozilla.org/en-US/docs/Glossary/Largest_contentful_paint)
    292. [Latency](https://developer.mozilla.org/en-US/docs/Glossary/Latency)
    293. [Layout mode](https://developer.mozilla.org/en-US/docs/Glossary/Layout_mode)
    294. [Layout viewport](https://developer.mozilla.org/en-US/docs/Glossary/Layout_viewport)
    295. [Lazy load](https://developer.mozilla.org/en-US/docs/Glossary/Lazy_load)
    296. [Leading](https://developer.mozilla.org/en-US/docs/Glossary/Leading)
    297. [LGPL](https://developer.mozilla.org/en-US/docs/Glossary/LGPL)
    298. [Ligature](https://developer.mozilla.org/en-US/docs/Glossary/Ligature)
    299. [Literal](https://developer.mozilla.org/en-US/docs/Glossary/Literal)
    300. [Local scope](https://developer.mozilla.org/en-US/docs/Glossary/Local_scope)
    301. [Local variable](https://developer.mozilla.org/en-US/docs/Glossary/Local_variable)
    302. [Locale](https://developer.mozilla.org/en-US/docs/Glossary/Locale)
    303. [Localization](https://developer.mozilla.org/en-US/docs/Glossary/Localization)
    304. [Logical properties](https://developer.mozilla.org/en-US/docs/Glossary/Logical_properties)
    305. [Long task](https://developer.mozilla.org/en-US/docs/Glossary/Long_task)
    306. [Loop](https://developer.mozilla.org/en-US/docs/Glossary/Loop)
    307. [Lossless compression](https://developer.mozilla.org/en-US/docs/Glossary/Lossless_compression)
    308. [Lossy compression](https://developer.mozilla.org/en-US/docs/Glossary/Lossy_compression)
    309. [LTR (Left To Right)](https://developer.mozilla.org/en-US/docs/Glossary/LTR)
    310. [Main axis](https://developer.mozilla.org/en-US/docs/Glossary/Main_Axis)
    311. [Main thread](https://developer.mozilla.org/en-US/docs/Glossary/Main_thread)
    312. [Markup](https://developer.mozilla.org/en-US/docs/Glossary/Markup)
    313. [MathML](https://developer.mozilla.org/en-US/docs/Glossary/MathML)
    314. [Media](https://developer.mozilla.org/en-US/docs/Glossary/Media)
      1. [Media (Audio-visual presentation)](https://developer.mozilla.org/en-US/docs/Glossary/Media/Audio-visual_presentation)
      2. [Media (CSS)](https://developer.mozilla.org/en-US/docs/Glossary/Media/CSS)
    315. [Media query](https://developer.mozilla.org/en-US/docs/Glossary/Media_query)
    316. [Metadata](https://developer.mozilla.org/en-US/docs/Glossary/Metadata)
    317. [Method](https://developer.mozilla.org/en-US/docs/Glossary/Method)
    318. [Microsoft Edge](https://developer.mozilla.org/en-US/docs/Glossary/Microsoft_Edge)
    319. [Microsoft Internet Explorer](https://developer.mozilla.org/en-US/docs/Glossary/Microsoft_Internet_Explorer)
    320. [Middleware](https://developer.mozilla.org/en-US/docs/Glossary/Middleware)
    321. [MIME](https://developer.mozilla.org/en-US/docs/Glossary/MIME)
    322. [MIME type](https://developer.mozilla.org/en-US/docs/Glossary/MIME_type)
    323. [Minification](https://developer.mozilla.org/en-US/docs/Glossary/Minification)
    324. [MitM](https://developer.mozilla.org/en-US/docs/Glossary/MitM)
    325. [Mixin](https://developer.mozilla.org/en-US/docs/Glossary/Mixin)
    326. [Mobile first](https://developer.mozilla.org/en-US/docs/Glossary/Mobile_First)
    327. [Modem](https://developer.mozilla.org/en-US/docs/Glossary/Modem)
    328. [Modularity](https://developer.mozilla.org/en-US/docs/Glossary/Modularity)
    329. [Mozilla Firefox](https://developer.mozilla.org/en-US/docs/Glossary/Mozilla_Firefox)
    330. [Multi-factor authentication](https://developer.mozilla.org/en-US/docs/Glossary/Multi-factor_authentication)
    331. [Mutable](https://developer.mozilla.org/en-US/docs/Glossary/Mutable)
    332. [MVC](https://developer.mozilla.org/en-US/docs/Glossary/MVC)
    333. [Namespace](https://developer.mozilla.org/en-US/docs/Glossary/Namespace)
    334. [NaN](https://developer.mozilla.org/en-US/docs/Glossary/NaN)
    335. [NAT](https://developer.mozilla.org/en-US/docs/Glossary/NAT)
    336. [Native](https://developer.mozilla.org/en-US/docs/Glossary/Native)
    337. [Navigation directive](https://developer.mozilla.org/en-US/docs/Glossary/Navigation_directive)
    338. [Netscape Navigator](https://developer.mozilla.org/en-US/docs/Glossary/Netscape_Navigator)
    339. [Network throttling](https://developer.mozilla.org/en-US/docs/Glossary/Network_throttling)
    340. [NNTP](https://developer.mozilla.org/en-US/docs/Glossary/NNTP)
    341. [Node](https://developer.mozilla.org/en-US/docs/Glossary/Node)
      1. [Node (DOM)](https://developer.mozilla.org/en-US/docs/Glossary/Node/DOM)
      2. [Node (networking)](https://developer.mozilla.org/en-US/docs/Glossary/Node/networking)
    342. [Node.js](https://developer.mozilla.org/en-US/docs/Glossary/Node.js)
    343. [Non-normative](https://developer.mozilla.org/en-US/docs/Glossary/Non-normative)
    344. [Nonce](https://developer.mozilla.org/en-US/docs/Glossary/Nonce)
    345. [Normative](https://developer.mozilla.org/en-US/docs/Glossary/Normative)
    346. [Null](https://developer.mozilla.org/en-US/docs/Glossary/Null)
    347. [Nullish value](https://developer.mozilla.org/en-US/docs/Glossary/Nullish)
    348. [Number](https://developer.mozilla.org/en-US/docs/Glossary/Number)
    349. [Object](https://developer.mozilla.org/en-US/docs/Glossary/Object)
    350. [Object reference](https://developer.mozilla.org/en-US/docs/Glossary/Object_reference)
    351. [OOP](https://developer.mozilla.org/en-US/docs/Glossary/OOP)
    352. [OpenGL](https://developer.mozilla.org/en-US/docs/Glossary/OpenGL)
    353. [OpenSSL](https://developer.mozilla.org/en-US/docs/Glossary/OpenSSL)
    354. [Opera browser](https://developer.mozilla.org/en-US/docs/Glossary/Opera_Browser)
    355. [Operand](https://developer.mozilla.org/en-US/docs/Glossary/Operand)
    356. [Operator](https://developer.mozilla.org/en-US/docs/Glossary/Operator)
    357. [Origin](https://developer.mozilla.org/en-US/docs/Glossary/Origin)
    358.