Connect LDAP or Active Directory server to your instance to use the global authorization data such as usernames, passwords.
Integrate third-party Single-Sign-On authentication into your instance. Users will be able to use their profiles in other services to log in to the instance.
The delegation is the ability to give other users the access to view and interact with tasks and approvals assigned to other user, and to receive copies of all their notifications.
Impersonate other authenticated users for testing purposes. As an impersonator, you have the access to exactly what the other user can access in the system.