Mobile DSPs (Demand Side Platforms) are increasingly becoming the key channel for advertisers, mobile app developers, agencies and media buyers seeking access to mobile advertising inventory. Mobile DSPs aggregate supply from a range of mobile ad networks and exchanges and allow access via a single dashboard and buying point. Increasingly Mobile DSPs are adding additional value such as the use of data or a service layer or campaign management on top of the basic ad buying platform. The growth mobile Real Time Bidding (RTB) has also opened up new opportunities for Mobile DSPs to provide access to mobile inventory on an impression by impression basis. This can have a huge impact in terms of the efficiency of mobile campaigns and deliver the ROI that can make all the difference.