With this PlayStation App, you can see what your friends are playing at any time, compare their trophies with yours, and check on your profile and recent activity on the PlayStation Network.
And, of course, you can chat with all your friends, receive notifications, game alerts and invitations, and use your mobile device like a keyboard when you use your PlayStation 4 console (much more useful than the controller).
Another great feature of the app is that it enables you to browse the PlayStation Store, choose games and add-ons, and then transfer them to your console so that they're ready by the time you get home. In other words, you can use your phone to get any download or update started even if you're far away from your physical console.
PlayStation App is an intriguing app if you own a PlayStation 4, since it gives you access to lots of interesting features.