This document discusses hybrid mobile app development. A hybrid app is created with web technologies like HTML, CSS, and JavaScript and can run on multiple platforms. Hybrid apps are cross-platform, have quicker development times than native apps, and can access some native device features through plugins. Popular frameworks for building hybrid apps include PhoneGap/Cordova and Ionic, which are open source and allow building apps using web technologies that look and feel native. The document provides an overview of these frameworks and references for further information.