butterfly/kb
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
1e607b77b0
kb/data/developer.mozilla.org/en-US/docs/Glossary/Domain-0.md

10 KiB
Raw Blame History

title chunk source category tags date_saved instance
Domain - Glossary | MDN 1/3 https://developer.mozilla.org/en-US/docs/Glossary/Domain reference web, html, css, javascript, documentation 2026-05-05T05:29:58.724267+00:00 kb-cron

MDN HTML HTML: Markup language

HTML reference

HTML guides

Markup languages

CSS CSS: Styling language

CSS reference

CSS guides

Layout cookbook

JavaScriptJS JavaScript: Scripting language

JS reference

JS guides

Web APIs Web APIs: Programming interfaces

Web API reference

Web API guides

All All web technology

Technologies

Topics

Learn Learn web development

Frontend developer course

Learn HTML

Learn CSS

Learn JavaScript

Tools Discover our tools

About Get to know MDN better

Blog

  1. Glossary
  2. Domain

Domain

A domain is an authority within the internet that controls its own resources. Its "domain name" is a way to address this authority as part of the hierarchy in a URL - usually the most memorable part of it, for instance a brand name. A fully qualified domain name (FQDN) contains all necessary parts to look up this authority by name unambiguously using the DNS system of the internet. For example, in "developer.mozilla.org":

  1. "org" is called a top-level domain. They are registered as an internet standard by the IANA. Here, "org" means "organization" which is defined in a top-level domain registry.
  2. "mozilla" is the domain. If you like to own a domain you have to register it with one of the many registrars who are allowed to do so with a top-level domain registry.
  3. "developer" is a "sub-domain", something you as the owner of a domain may define yourself. Many owners choose to have a subdomain "www" to point to their World_Wide_Web resource, but that's not required (and has even fallen somewhat out of favor).

In this article

See also