This document provides information about various mobile application platforms including Android, iOS, Windows Phone, Firefox OS, and Tizen. It discusses the companies that developed each platform, the programming languages used, example release dates and versions. The document also discusses reasons for developing mobile apps such as revenue opportunities from paid apps, in-app purchases, and mobile advertising. It notes that the easiest platforms to develop for depend on factors like intended users and app complexity. Tools for mobile development like PhoneGap are also mentioned.