The document discusses the SharePoint client object model (COM) which allows remote access and manipulation of SharePoint data from client applications. It covers the three flavors of client OM: ECMA Script, .NET managed, and HTML5/mobile. Key points include batch processing for performance, integration with line of business applications, simplifying the user interface with client-side programming, enabling HTML5 features, and using jQuery for mobile development. Limitations include inability to access certain features like search and profiles, and throttling of requests to the server.