This document discusses various revenue sources and strategies for monetizing mobile apps. It outlines revenue that can be generated through app stores like paid downloads, in-app purchases, and subscriptions. It also discusses generating revenue from ads networks and private placement ads outside of app stores. The document provides details on each revenue stream and factors that influence their success like download volumes, user engagement and retention. It concludes with tips for improving app rankings and downloads through app store features, charts and keyword search optimization.