It is necessary to keep alert whenever you bring your Mac outside. As you know, everyone love Mac so your Mac will be in danger if you leave it open in the crowd. Therefore, you need the easiest way to lock your screen.
Screen saver hot corner is the place that gives mouse authority to put Mac into sleep.
There will be four hot spot that can be chosen, it's a matter of freedom to choose one or even four of them. While mouse being quickly moved from one random point to this hot spot, Mac will fall asleep.
This is where the Mac get its protection, password is needed whenever Mac is being woken up from sleep mode or screen saver mode. That's why the hot corner before needs to be done to make it easier to secure Mac.
Actually, the setting is located right before eyes in the form of check box, that's why it needs to be ticked to activate.
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