About

An ORM built by Microsoft and is available as part of .Net framework 3.5 and later.

ADO.NET Entity Framework abstracts the relational (logical) schema of the data that is stored in a database and presents its conceptual schema to the application. This abstraction eliminates the object-relational impedance mismatch that is otherwise common in conventional database-oriented programs.

Read more about it in MSDN : http://msdn.microsoft.com/en-us/library/bb399572.aspx

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