LINQ is the name for the overall system. LINQ can be written using two different styles:

    // Method syntax
    var evenNumbers = numbers.Where(num => num % 2 == 0).OrderBy(n => n);

    // Query syntax
    var evenNumbers = from num in numbers
        where num % 2 == 0
        orderby num
        select num;

Method syntax and query syntax are both part of LINQ (query syntax is syntactic sugar). .Net developers tend to overwhelmingly prefer method syntax.