The most common theme, of course, is gaming.
And now, Microsoft is leading the charge with an Xbox app store.
Microsoft has confirmed that it will launch an Xbox mobile gaming store in July.
Lucas Gouveia / How-To Geek |KateV28/ Shutterstock
It will start out as a web-based experience before branching out into a set of true mobile app stores.
Initially, the store will focus on Microsoft’s own mobile games, including popular titles likeCandy CrushandMinecraft.