PowerPoint 2016, like the other applications in the Office 2016 suite, offers a new "Tell Me" feature. In the case of PowerPoint, it's called Tell Me What to Do.
The Ribbon in PowerPoint 2016 contains scores of buttons that enable you to use any of PowerPoint's many features for creating and formatting slides. Unfortunately, the Ribbon can sometimes be difficult to navigate. You'll often find yourself unsure of which Ribbon tab contains the button you're looking for.
That's where the Tell Me What to Do box comes in. This search box is located above the right side of the Ribbon. Type what you want to do in this box, and PowerPoint will take you directly to the Ribbon button that lets you do it. For example, if you type Open, the Open button from the File menu appears. This feature can be a great timesaver when you know what you want to do but you aren't sure exactly where in the Ribbon the correct button is located.