Whenever you shut down a Mac you also are logged out of your account. If there are multiple users on your system, you can log out and allow another user to log in without having to perform a restart.
What does a Log Out do?
When you log out, all running applications, open files, and work you were doing are ended. You will be asked to save anything that has not been saved before your account is logged out.
Ways to Log Out
There are several ways to log out of a Mac. You can simply perform a shut down or perform any of the following:
Use the Apple Menu

When you log out, all running applications, open files, and work you were doing are ended. You will be asked to save anything that has not been saved before your account is logged out.
Ways to Log Out
There are several ways to log out of a Mac. You can simply perform a shut down or perform any of the following:
Use the Apple Menu
- Click the Apple Icon, then click Logout

Use the Keyboard
If Fast User Switching is Enabled
Fast User Switching is a feature that can be enabled for Macs with multiple user accounts that allows one user to log in without requiring another user to log out. If enabled, the Fast User menulet will be visible. To log out just follow one of the log out procedures. Mac OS X will then display the Login window if any other accounts are active.
- Simultaneously press the Shift-Command-Q keys.
If Fast User Switching is Enabled
Fast User Switching is a feature that can be enabled for Macs with multiple user accounts that allows one user to log in without requiring another user to log out. If enabled, the Fast User menulet will be visible. To log out just follow one of the log out procedures. Mac OS X will then display the Login window if any other accounts are active.
