Xbox SmartGlass is an app that turns your mobile phone, tablet, or PC into a second screen that interacts with your Xbox—you’ll be able to use your device to navigate, type, and search on your console.
SmartGlass also gives you extra info about the games, TV shows, and movies you’re playing or watching. And when you’re away from your console, use SmartGlass to track achievements, get game help, message friends, and watch game clips.
There are two versions of SmartGlass: one for Xbox 360 and one for Xbox One.
To get it for free for Xbox 360 or Xbox One, go to your device's store and search for "SmartGlass." It's available for Windows Phone, Android, Apple iOS, Windows 8, Windows RT, and Windows 10 devices.
If you have Windows 10, you already have the Xbox app, which has many of the same features as SmartGlass (plus more, like game streaming). You'll find the Xbox app pinned in Start or listed in All apps.