Subdomain

DNS domains that are part of others

A subdomain is the portion shown before a domain name, separated by a dot (.)

For example, a domain might look like this

example.com

Whereas the subdomain of this domain might look like this, shown here in bold

subdomain.example.com

Examples change

 

Many sites use sub domains for applications such as email, calendars or different languages, including these examples. Subdomains again shown in bold