Mission Control gives you a bird's eye view of everything that's happening on your Mac. Originally called Exposé, Mission Control has evolved to provide a single interface to view every open window and open app on your Mac all at once. It brings those together will full-screen apps, Dashboard widgets, and any open Desktops you have on the Mac, so you can hop between what you need with the click of a mouse or trackpad. To access Mission Control using a trackpad, just swipe up with three fingers. You can also activate Mission Control by clicking on its icon in the dock, or by pressing the F3 key on Apple keyboards.