域是互联网中控制其自身资源的"权威"。它的“域名”是一种在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。

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

 

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).

 

 

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