The document discusses apps for SharePoint and Office. It describes how to create SharePoint-hosted apps to facilitate site provisioning and add functionality like commenting on documents. App shapes for SharePoint include full-page apps, parts, and command extensions. App shapes for Office include task panes, content apps, and inline panes. The "Comment a document" app example embeds comments in the document and stores them in the app web for security, using CSOM/REST and JavaScript.