What is the LINQ? How many types of LINQ

         LINQ Stands for Language Integrated Query.  It was a new query language designed by Microsoft  introduced in c# 3.0  (or) .Net 3.5 same as SQL database.
             
             SQL can be used for querying only on SQL databases. where as LINQ is designed to query to Query on collections and Arrays, Sql databases, XML  and Entities.
     LINQ has four classifications to it.

1. LINQ to Collection
2. LINQ to SQL
3. LINQ to XML
4. LINQ to entities.