Updated: 06/07/2019 by Computer Hope
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 for Computer Hope and "www" is the subdomain. If we wanted an FQDN for a sub page or another external domain, such as our help section, we would create "help.computerhope.com" as a subdomain.
Subdomains are often used for links to frequently accessed portions of the site, allowing users to remember only the domain and not the entire URL.
Domain, Hostname, Internet terms, Network terms, Second-level domain, URL, Web design terms