The main directory of a disk is called the ________ directory
The main directory of a disk is called the root directory.
It can be likened to the trunk of a tree, as the starting point where all branches originate from. The root file system is the file system contained on the same disk partition on which the root directory is located; it is the filesystem on top of which all other file systems are mounted as the system boots up.
In a computer file system, and primarily used in the Unix and Unix-like operating systems, the root directory is the first or top-most directory in a hierarchy. It can be likened to the trunk of a tree, as the starting point where all branches originate from.
The document root is the folder where the website files for a domain name are stored. Since cPanel allows for multiple domain names (addon domains and subdomains), you need to have a unique folder for each domain. Your primary domain is rooted in the public_html folder.