Entity Framework vs Linq to Entities vs Linq to SQL

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I read a lot of articles about how to work with a database in WPF .Net 4 application. As I understood, the main two technologies are:

  • Linq to SQL (L2S)
  • Entity Framework (EF)

but sometimes I also can see mention of Linq to Entities (L2E) technology, but can't find clear explanation what difference between EF and L2E.

So, my question is: Does there is any difference between Entity Framework and Linq to Entities technologies? Or this is synonyms for one technology?

linq-to-sql ado.net linq-to-entities entity-framework
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