Subdomain

Alternatively called a child domain, hostname, or leaf domain, a subdomain is a domain name with a prefix. For example, "www.computerhope.com" is the URL (uniform resource locator) for Computer Hope, and "www" is the subdomain. If we wanted an FQDN (fully qualified domain name) for a sub page or another external domain, such as our help section, we would create "help.computerhope.com" as a subdomain.

Domain, Hostname, Internet terms, Network terms, Second-level domain, URL, Web design terms