---
title: 域
slug: Glossary/Domain
tags:
  - 域
translation_of: Glossary/Domain
---
<p>域是互联网中控制其自身资源的"权威"。它的“域名”是一种在{{Glossary("URL")}}中作为这个层次结构的一部分来标记出这种“权威性”的方式-通常是最令人难忘的部分，例如品牌名称。</p>

<p>完全限定域名（FQDN）包含通过 {{Glossary("DNS")}} 系统明确地按名称查找此“权威”的所有必要部分。</p>

<p> </p>

<p>For example, in "developer.mozilla.org":</p>

<ol>
 <li>"org" is called a {{interwiki("wikipedia", "Top-level_domain", "top-level domain")}}. They are registered as an internet standard by the {{interwiki("wikipedia", "Internet_Assigned_Numbers_Authority", "IANA")}} . Here, "org" means "organization" which is defined in a top-level <em>domain registry</em>.</li>
 <li>"mozilla" is the domain. If you like to own a domain you have to register it with one of the many {{interwiki("wikipedia", "Domain_name_registrar", "registrars")}} who are allowed to do so with a top-level domain registry.</li>
 <li>"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 {{Glossary("World_Wide_Web")}} resource, but that's not required (and has even fallen somewhat out of favor).</li>
</ol>

<p> </p>

<p> </p>

<h2 id="学习更多">学习更多</h2>

<ul>
 <li>在维基百科中的 {{interwiki("wikipedia", "域")}}</li>
</ul>