Logical Layer: The Logical Layer also called Storage Layer is defined by the Store Schema Definition Language (SSDL) and defines the structure of the tables and relations between them.
Conceptual Layer: The Conceptual Layer is defined by the Conceptual Schema Definition Language (CSDL) and defined .NET classes.
Mapping Layer: The Mapping Layer is defined by Mapping Specification Language (MSL) and connects the entity type definition from the CSDL to the metadata defined in the SSDL, hence the name C-S mapping. So the mapping is essentially from .NET classes to the table structure and its relations.
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