TekRevue:

The first step to taking timed screenshots on the Mac is to launch the Grab program. To do so, open your Applications folder, and then find the subfolder labeled “Utilities.” Inside the utilities folder is the Mac’s built-in screenshot application called Grab.app.

Double-click on Grab.app to open it, and you’ll see its menus appear across the top of your screen in the Menu Bar. The Grab app allows you to take standard screenshots like the ones detailed in our previous article, but the real magic is its ability to take timed screenshots on a countdown delay. You’ll find this option in Capture > Timed Screen.

I’m sure a lot of you already knew this but I didn’t even know there was a Grab app on my Mac.