What specific data type is used to implement delegates in the programming language?

In C#, delegates are implemented as objects of type System.Delegate or more specifically System.MulticastDelegate.

These are special types that encapsulate references to methods with a specific signature. When declaring a delegate, the compiler creates a class inheriting from MulticastDelegate.

Example of declaring a delegate:

delegate void MyDelegate(string message);

Internally, MyDelegate is a class derived from MulticastDelegate that stores method references and allows invoking them through delegate objects.