What is a Domain?

Map Of Internet 1973


The term domain is just the equivalent short name for a DNS name (ie Domain name).

For more information, check the dedicated page: What is a Domain Name in DNS ?

Usage Example

This examples show how the domain name is used to define a host resource.


The Hostname is a domain name that identifies a host.

Example: host.example.com is a domain name

Email address

In the email address label@name, the domain name is the part after the arobase.

The domain portion identifies the point (node) to which the mail should be delivered:


In a url: https://host/path?query#fragment, the domain name is the host part that identifies a HTTP server.

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Map Of Internet 1973
Network - Fully Qualified Domain Name (FQDN)

FQDN stands for fully qualified domain name. It's a name that is said to be absolute (ie that includes the local domain and ends with a dot). This name identifies uniquely a node in the namespace....
Map Of Internet 1973
What is a Domain Name in DNS ?

The term domain name is a name: in the Domain NameSpace (DNS) that identifies an object (or node) in the domain database (ie a DNS database or a local host file) known mostly as domain, its...

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