Why Use Groups?
Every user belongs to some primary group, generally a group that has the same name as the user and the user as its only member. This can be changed as you see fit; for instance, you might decide to have all users belong to the “users” group as their primary group. However, having a different group for every user gives you more flexibility. It’s also a more secure model. More information on unique “personal” groups and why they’re useful can be found in man adduser.
Each user can also belong to any other groups in the system, such as other users’ “personal” groups, the wheel group, or any other group you create (by adding the user to the /etc/group file, as you’ll see later). However, the super-user is the only one who can control ...
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