The document discusses the SharePoint 2013 REST API. It begins with an introduction that describes the REST architecture and how the SharePoint REST API is implemented. It then covers endpoints for various SharePoint objects that can be accessed via REST, such as sites, lists, search, and user profiles. The document also discusses basic operations for retrieving and manipulating objects and more advanced methods like queries, filtering, sorting and CRUD operations. It describes using the REST API from JavaScript and Windows 8 applications. Authorization techniques are also covered. The document is sponsored by a company that provides monitoring tools for SharePoint.