subdomain

Subdomain(s) is a smaller part of the larger domain. It is a second website, with its own unique content, but there is no new domain name. Instead, you use an existing domain name and change the www to another name. Subdomains are the third level domains that are used to organize your website content. The subdomain name looks like forums.domain.com, help.domain.com, help2.domain.com (assuming you already host domain.com).

Subdomain is also called a child domain, a domain that is a part of a larger domain name in DNS hierarchy. DNS hierarchy consists of the root-level domain at the top, underneath which are the top-level domains, followed by second-level domains and finally subdomains.

The Domain Name System (DNS) is all about hierarchy. Everything starts with a Top Level Domain (TLD) like .com, .org, .net, or, for example, .me. After that, we have the next step in domain names, like google.com, facebook.com, or domain.me. After that, we start with subdomains, like calendar.google.com, plus.google.com, or blog.yourwebsite.me.