What class or data type is returned when using the Where method in LINQ?

The Where method in LINQ returns an object that implements the IEnumerable<T> interface. It is a deferred (lazy) sequence that, when enumerated, applies the specified filter condition to the source collection. The return type is usually IEnumerable<T>, where T is the type of elements in the source collection.

Example:

var numbers = new List<int> {1, 2, 3, 4, 5};
var evenNumbers = numbers.Where(n => n % 2 == 0); // evenNumbers has type IEnumerable<int>

foreach(var num in evenNumbers)
{
    Console.WriteLine(num); // Will output 2 and 4
}