Groups
Use the Groups form to create groups and to assign users to them. These groups can be organized in any way that makes sense for your company or organization -- by location, by organization, by job description, and so on.
You can assign users to groups in such a way that you can then create group authorizations that apply to every user in the group. In this way, groups offer an easy and efficient way to assign permissions.
Similarly, you can use "nested" or "composite" groups and "subgroups" to apply the permissions of multiple groups to a set of users.