Phonegap allows developing hybrid mobile apps using HTML5, CSS, and JavaScript that can be deployed across various platforms like Android and iOS. It provides APIs to access native device functionality like contacts and sensors from webviews. The presentation demonstrated building basic and advanced Phonegap apps for Android using tools like Phonegap Build, Dojo Mobile, Sencha Touch, Maqetta, and Ripple. It promotes Phonegap for developing cross-platform mobile apps more easily than purely native or web approaches.