The permissions application allows you to create permission groups, which, when applied to a user, gives that user access to different applications. A permission group can be thought of as a set of keys which unlocks different applications or aspects of an application to a user. What this means is that normal users have no rights to do anything, it is only as they are assigned permission groups that applications open up to them.
Tip: You can automatically assign permission groups to users via the hooks file.
Super users have access to all aspects of all applications. You can set them in the conf.php file in permission’s config/ directory. By default the admin user is a super user.