A subdomain is a secondary domain that is part of a larger domain. It is used to organize and structure the content of a website, creating distinct sections that can be accessed independently.
Subdomains precede the main domain name and are often employed to host specific functions or content types without affecting the organization of the primary domain.
A blog hosted on a subdomain such as "blog.example.com," separate from the main website hosted on "www.example.com."