The document discusses PhoneGap, an open source framework for building cross-platform mobile apps using HTML5, CSS, and JavaScript. It explains that PhoneGap allows developers to create apps for multiple platforms like iOS, Android, and Windows Phone from a single codebase by wrapping web apps with the PhoneGap framework. The document also provides information on how PhoneGap works, getting started with PhoneGap Build, supported mobile platforms, examples, and a sample PhoneGap application.