Subdomain

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 
Many sites use sub domains for applications such as email, calendars or different languages, including these examples. Subdomains again shown in bold
 mail.yahoo.com
 calendar.google.com
 en.wikipedia.org

Category:Domain Name System