Root

1. Also known as an admin, administrator, and gatekeeper, root is a super user on a computer network. Generally, a root is used to refer to the system administrator on a Unix / Linux network and is an individual who has complete access to a network.
2. The highest level in a directory hierarchy. For example, in MS-DOS, the root of the primary hard disk drive would C:\.

• See our su or super user command page for additional information on this command and/or visit our Unix / Linux help page for a full listing of commands and help.
• Additional information and help with MS-DOS can be found on our MS-DOS help page. 
• Users in the Microsoft recovery console can set the current directory to the system root directory by using the systemroot command.

Also see: Administrative, BOFH, Full rights, Hierarchical file system, Home, Moderator, Op, Power user, Remote admin, Security definitions, Sysop