The textbook demonstrates how to create apps consistently for different platforms and app stores using the Cordova framework. The programming of the apps utilizes established web technologies such as HTML5, CSS3, JavaScript, and web frameworks as well as web APIs. The author focuses on the reference systems Android, Windows Phone, and iOS. However, the discussions on Cordova also apply to other mobile operating systems. The topics covered in the book range from the detailed setup of Cordova projects, including hardware-related questions, to an in-depth treatment of the framework and its libraries, the creation of a suitable app interface, accessing typical elements of a modern smartphone (geolocation, orientation, camera, audio playback, etc.), and finally, the distribution and marketing of apps.