This document discusses cross-platform mobile app development using PhoneGap. It describes PhoneGap as a hybrid mobile framework that allows building apps with HTML, CSS, and JavaScript that can be deployed to iOS, Android, and other platforms. It outlines the steps to install PhoneGap and create a basic app, including adding platforms, building, and debugging. It also mentions some popular HTML frameworks, core PhoneGap plugins, and using PhoneGap Build for one-click deployment.