LINQ stands for Language Integrated Query. It is introduced in .net framework 3.5. LINQ integrated accessibility of data and query into language. LINQ makes easier to work with data.
There are so many LINQ Providers are available but some most important are as follows:-
We use System.Linq namespace
The return type of LINQ to Object is IEnumerable
In LINQ both are used to concat two data source. But when we use union method then it will remove redundancy but concat do not remove redundant data and concat two data sources as it is.