Difference between Server,Ecma and Managed Client object model

Server objects , client objects  and Managed .Net client objects

S.No.	Ecma Script	Server Object Model	.Net Managed
1	SP.ClientContext	Microsoft.SharePoint.SPContext	Microsoft.SharePoint.Client.ClientContext
2	SP.Site	Microsoft.SharePoint.SPSite	Microsoft.SharePoint.Client.Site
3	SP.Web	Microsoft.SharePoint.SPWeb	Microsoft.SharePoint.Client.Web
4	SP.List	Microsoft.SharePoint.SPList	Microsoft.SharePoint.Client.List
5	SP.ListItem	Microsoft.SharePoint.SPListItem	Microsoft.SharePoint.Client.ListItem
6	SP.Field	Microsoft.SharePoint.SPField	Microsoft.SharePoint.Client.Field