Client Object Model

Microsoft SharePoint 2010 Software Development Kit (SDK) introduces three new client APIs that allow you to interact with SharePoint sites from script that executes in the browser

  1. from code (no earlier than Microsoft .NET Framework 3.5) that executes in a .NET managed application, or   

 2. from code that executes in a Microsoft Silverlight 2.0 application. 

3.; The new ECMAScript (JavaScript, JScript),

The following table shows the equivalent objects that the new APIs provide for common SharePoint Foundation 2010 server objects.

Server	.NET Managed and Silverlight	JavaScript
Microsoft.SharePoint.SPContext	Microsoft.SharePoint.Client.ClientContext	SP.ClientContext
Microsoft.SharePoint.SPSite	Microsoft.SharePoint.Client.Site	SP.Site
Microsoft.SharePoint.SPWeb	Microsoft.SharePoint.Client.Web	SP.Web
Microsoft.SharePoint.SPList	Microsoft.SharePoint.Client.List	SP.List
Microsoft.SharePoint.SPListItem	Microsoft.SharePoint.Client.ListItem	SP.ListItem
Microsoft.SharePoint.SPField (including major derived classes)	Microsoft.SharePoint.Client.Field	SP.Field
Microsoft.SharePoint.WebPartPages.SPLimitedWebPartManager	Microsoft.SharePoint.Client.WebParts.LimitedWebPartManager	SP.WebParts.LimitedWebPartManager

The new client APIs do not provide administration objects or objects that are scoped higher than site collection: SPSite class in the server object model.