A subdomain is a domain that is part of a larger domain, based upon a prefix name that you choose. For example, the example.com domain might have a subdomain for the support department that directs visitors to a separate area of the web site. If the subdomain prefix is support, then the fully qualified domain name (FQDN) is support.example.com.

You can use subdomains whenever you want to create separate areas on your web site that are accessible using different FQDNs.

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