Definition: Subdomain

A subdomain is part of a larger domain, usually separated by a dot and at the beginning of a domain name.

For example: – example is the domain name – test is a subdomain under

As can lead to a different website than it is essentially a different URL altogether. However, the owner of would be the only one able to create any subdomains (such as and so you can be sure that the subdomain is related to the main domain.

Most people use subdomains to separate out their site in a helpful way. For example, if a company has a strong brand name, and lots of products they might use subdomains to split them out.

For example: – goes to Google Search (their original product) – goes to Google Ads – goes to Google Business Profile – goes to Google AdSense

and so on.

Glossary Index