How does the Mac lock the screen?

How does the Mac lock the screen? Now, a lot of people are using Mac computers. We all know that the lock screen function can lock the screen when we leave the computer to prevent others from tampering with the computer. For Mac users, how do we set the Mac lock screen function? Here is a small series to the Mac new users simply introduce how the MAC lock screen.

1, first on the MAC open "Keychain Access" application, as shown in the picture

2, then click the "Keychain Access-preferences" option in the menu bar in turn, as shown in the picture

3. In the Keychain Preferences window, check the "Show Keychain status in menu bar" option, as shown in the picture

4, click the Lock icon in the menu bar, then click the "Lock Screen" option to lock the screen.

5, of course, if you are a MacBook Air or MacBook Pro laptop, you can simply cover the notebook.