This document discusses provider-hosted apps in SharePoint, which allow developers to build apps that run on their own web servers but integrate with SharePoint. It mentions technologies like Azure Web Sites, CSS, JavaScript, and ASPX that can be used, and how provider-hosted apps use remote web APIs and IFRAMEs to communicate with SharePoint. It also includes a table comparing capabilities of provider-hosted apps versus SharePoint apps for different actions like creating, updating, and deleting items, lists, and files.