Types of SAP User

There are 5 types of users in sap:-

1. Dialog user: - Normally it is used for interactive system access from GUI (used for human users)
2. System user: - Normally it is used for Background processing, communication within a system.
3. Communication user: - It is used for external RFC calls.
4. Service user: - Dialog user available to a larger, anonymous group of users.
5. Reference user: - General, non-person related users that allows the assignment of additional authorizations. Example, Internet users created with transaction SU01. No logon is possible.