This document discusses hybrid mobile app development using SharePoint APIs. It defines hybrid mobile apps as apps developed with HTML, CSS, and JavaScript that are wrapped inside a container providing access to native platform features. It compares web apps, native apps, and hybrid apps. It then explains that Cordova is a platform for building mobile apps with HTML, CSS, and JavaScript, and that Ionic is an open-source SDK for hybrid apps built on AngularJS and Cordova. The document provides steps for setting up development environments for Ionic, and concludes with a demo of creating a mobile app using Ionic and Office 365 APIs.