Question

What is LINQ?

Answer 1

Language Integrated Query (LINQ, pronounced "link") is a Microsoft .NET Framework component that adds native data querying capabilities to .NET languages, although ports exist for Java[1], PHP and JavaScript. (Wikipedia)

Answer 2

It basically lets you take a list, and perform actions on it.
The second line of this code uses LINQ to find all members in the list beginning with "t":
Dim lst = New List(Of String)({"one", "two", "three"})
Dim t_list = lst.Where(Function(a) a.StartsWith("t"))
Console.WriteLine(String.Join(",", t_list))

This VB code will output "two,three"