If your PC/Laptop/Tablet is shared, or if it has NOT been set to automatically ‘sleep’ after a period of inactivity, it is a good idea to either sign out or shutdown. Also, there may be times you need to restart your PC so that any changes made to your operating system can take effect.
It is always a good idea to close any documents and applications you may have open.
The simplest way to log out, shut down, restart Windows, or put the computer to sleep is:
Tip: you can also perform these actions using only the keyboard with Ctrl-Alt-Del: