built-in groups

built-in groups: The default security groups installed with the operating system. Built-in groups have been granted useful collections of rights and built-in abilities.

In most cases, built-in groups provide all the capabilities needed by a particular user. For example, members of the built-in Backup Operators group can back up and restore files and folders. To provide a needed set of capabilities to a user account, assign it to the appropriate built-in group.