Mobile app development is the process by which a mobile application is developed for mobile devices. These apps can be pre-installed on mobile phones during the manufacturing of platforms, or these may be delivered as web applications using client-side or server-side processing. Mobile apps are developed, managed and deployed in certain platform organizations that consist of several tools and components. These include front-end development tools, security add-on layers, back-end servers, system software and emulators for mobile app testing. Mobile user interface design is an essential process in the creation of mobile apps. It considers contexts, screen, constraints, mobility and input as outlines for design. This textbook is compiled in such a manner, that it will provide in-depth knowledge about the theory and practice of mobile app development. It presents this complex subject in the most comprehensible and easy to understand language. Coherent flow of topics, student-friendly language and extensive use of examples make this book an invaluable source of knowledge.