There are 4 standard access levels.
Administrator:
Full access to the system. Add, remove, and edit users, groups; and more.
Standard:
Limited access to the system. Does not allow the user to perform any Administration functions.
Read-Only:
Limited access to the system. Cannot delete, rename, move, copy, or format. Only allows the user to print documents.
No Access:
No access to the system. This type of user is mainly used for accountability purposes. Including a user with "No Access" simply includes a reference to that individual for a record of their contributions outside the system.