This book is a step-by-step guide about how to create a mobile app. Each chapter begins with the design of the user interface using wireframes as well as the data models using various diagrams. After the design, the chapter moves on to the implementation of the app, describing each block of code, including how it works and why it is needed in the context of the project. At the end of each project, various suggestions are proposed to help extend or enhance the project in order to stimulate your creativity and programming skills. If you are a developer looking to create a mobile app using HTML, CSS, and JavaScript, this book is for you. While this book should be approachable for anyone looking to create mobile apps using PhoneGap, you should have some degree of experience using HTML, CSS, and JavaScript. You should also be able to create the basic PhoneGap project in the IDE of your choice (XCode, Eclipse, or Visual Studio). Understanding Java, C#, or Objective C is not required.