subdomain

A name created under a registered domain, such as shop.example.com under example.com. The domain owner can create subdomains in their own DNS Domain Name System The internet's directory that links domain names to computer addresses. Full definition of DNS without registering anything new. registry The central database and system of a top-level domain, or loosely the organization that runs it. Full definition of registry and registrar A company that registers domain names for customers with the registry. Full definition of registrar are not normally involved in subdomains.

category
DNS and technical foundations