Multi User Levels
Drupal allows users to register, log in, and log out. Users benefit from being able to sign on because this associates content they create with their account and allows various permissions to be set for their roles.
Roles are set for users, which can be set up with fine-grained permissions allowing each role to do only what the administrator permits. Each user is assigned one or more roles. A user who has not logged in can not add/edit content.