As far as my knowledge, LINQ provide a general and easy to use interface/way to access data in various position(memory, database, xml files, web services, and etc.)
Am I right?
There's many layers to LINQ. At the C# 3.0 syntax level it provides, essentially, a new SQL-like syntax for querying collections of data (like IEnumerable, IQueryable, etc.). Beyond the language syntax, it provides various abstractions between database layers with an IQueryable interface that can then be used with the new query syntax. This is step forward for many reasons, like compile-time type checking of query syntax, consistent enumeration of query results as a collection, etc.
