UserGroups
A UserGroup is a collection of users. User groups are namespace providers, which means when a user group is created, it also creates a namespace to group the user group's resources under a single point of reference.

You can create user groups to meet your requirements, add users to them, and name them by defining their _userType property.
For more information on other namespace providers, see the following concepts:
Schema#
For more information on the user group schema, see UserGroup schema.
System UserGroups: Platform roles
There are existing system UserGroups which are preconfigured platform roles