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Domain Name System (DNS) sub domains are a type of domain name. A sub domain is a portion of a domain name, typically a subsection of the domain name that is specific to a certain organization, website, or service. A DNS sub domain is a domain name that is under the control of a separate DNS server from the main domain name. When a user enters the sub domain into their web browser, the DNS server on their computer looks up the domain name using the main domain name as a base.

If the sub domain exists, the DNS server returns the corresponding website or service. If the sub domain does not exist, the DNS server returns a error.