After you are done using a session, it is a good idea to end it. Each session uses system resources that can affect how fast the SAP System responds to your requests.
Before you end a session, save any data you want to keep. When you end a session, the system does NOT prompt you to save your data.
If you have only one session open and you end it, you will log off from the system. However, before logging you off, the system prompts you to save your data.
You can either
The session is closed and you return to the previous session.