my answer is just simple. It is not applied in our daily conversation. Our English is like a book. We focus on grammar
The root account is the administrative account on Linux; this account has control over everything in the system.
root
With most Unix-derived systems, "root" is the super-user account.
Root
/root
One root account
In Linux and Unix-like systems, the "root" account is the only account with all possible privileges. The "root" password would be the password needed to access this account or assume its identity.
By default,there is only one account, root. However, most Linux distribution will either allow or make you set up a second administrative user account.
A "root" user has the power to do anything on a Linux system. A "normal user" will be assigned some of these capabilities based on what group they are in, but is generally prevented from running any commands that may affect the system outside of their home directory. Users can be granted "sudo" rights, which allows them to run the sudo command and temporarily be granted root privileges.
the sign for root partition in linux is : /
For the most part, every Unix-based and Unix-like (and by extension, Linux) distribution will have a root account (equivalent to a system administrator account in Windows). The remaining accounts will be allocated for the users and for certain applications.
To create a new user account under any Linux distribution use command called useradd. The system administrator is responsible for creating account. Login as root user (or use sudo command).