This document discusses the new SharePoint Online Apps and Napa, a browser-based tool for building Office and SharePoint apps. It begins with an overview of the evolution of SharePoint development and the introduction of the app model. It then covers the different types of SharePoint apps and APIs, as well as apps for Office. A demo of Napa shows how to create various apps. The document concludes by explaining how to publish apps to the Office Store or an organizational app catalog.