If you've ever wanted to your screen on your Mac, this is the way to do it. You don't even need to download anything or go through setting up anything.
Every Mac comes with QuickTime and there is a very neat feature in the media player that allows you to record anything on your screen.
Simply open up QuickTime, go to File and then click on New Screen Recording. QuickTime will then give you the ability to choose if you want to record the whole screen or only part of it.