Microsoft SharePoint Foundation 2010 introduces three new client APIs for interacting with SharePoint sites: from a .NET managed application (Microsoft® .NET Framework 3.5 or later), from a Silverlight application (Microsoft® Silverlight™ 2.0), or from ECMAScript (JavaScript, JScript) that executes in the browser. These new APIs provide access to a subset of the types and members that are contained in the Microsoft.SharePoint namespace of the server-side object model.

The new client object models provide an object-oriented system for interoperating with SharePoint data from a remote computer, and they are in many respects easier to use than the already existing SharePoint Foundation Web services. You start by retrieving a client context object that represents the current request context, and through this context, you can obtain access to client objects at site-collection level or lower in the SharePoint Foundation hierarchy. Client objects inherit from the ClientObject class (ECMAScript: ClientObject), and you can use them to retrieve properties for a specific SharePoint object, to retrieve child objects and their properties, or to retrieve child items from a collection.