What is and how to use Converter Generic Delegate in C#?

REF:http://msdn2.microsoft.com/en-us/library/kt456a2y.aspx
Represents a method that converts an object from one type to another type.

Remarks

This delegate is used by the ConvertAll method of the Array class and the ConvertAll method of the List class to convert each element of the collection from one type to another.