What Is Root Domain?
The root domain is a website's main component that usually contains a domain name specific to that website and a top-level domain (TLD) extension.
As for websites, the root domain refers to the page that is at the top level in the entire hierarchy which is usually the homepage.
Within a site's hierarchy, individual pages or subdomains can operate individually, they should be developed from the root domain.
It simply means that to make individual pages' URLs considered part of the same website, they must have the same root domain included in each of them.
Understand this with the help of an example, our website's root domain is seodebate.com.
All the pages on this website such as "seodebate.com/about," "seodebate.com/blog," or "subdomain.seodebate.com," have root domain included in them to show that they are connected to this one root domain.