Main Domain and Subdomain Differences

Main Domain Name

Also called a first-level domain name, it has only one dot (point) like "mysite.com" (or two dots in the case of co.jp, ne.jp, etc.). The subdomain name comes before this domain name.

Subdomain Name

A domain name that comes before the main domain name, with multiple dots in the domain name. For example, "domain.mysite.com" is a second-level subdomain name.

Third-Level Subdomain Name

Simply add new content before "domain" in cases like "help.domain.mysite.com". N-level subdomain names are added before N-1 level subdomain names.

Directory

Similar to a folder that indicates a location on a computer; it is a path string.

"mysite.com" is generally considered the root directory of a website, and subdirectories are located under the root directory. Link paths are typically specified by adding "/" at the end of the domain name, like "www.mysite.com/agent". The "/" indicates a subdirectory.

Note:

With Ptengine, you can measure all subdomains and subdirectories under the main domain name by simply adding the main domain name.