If we look at C++ there is a feature called callback function. This feature uses Pointers to Functions to pass them as parameters to other functions. Delegate is a similar feature but it is more type safe which stands as a stark contrast with C++ function pointers. A delegate can hold reference/s to one more functions and invoke them as and when needed.

A delegate needs the method's name and its parameters (input and output variables) when we create a delegate. But delegate is not a standalone construction. it's a class. Any delegate is inherited from base delegate class of .NET class library when it is declared.

public delegate int Comparer(object obj1 object obj2);

This delegate declaration defines the signature of a delegate handler method that this delegate can refer to. The delegate handler method for the Comparer delegate can have any name but must have a first parameter of type object a second parameter of type object and return an int type.

A delegate is a strongly type of pointers.through delegate we can call any function even the class is sealed & with delegate we can create our own events to the controls

there are 2 type of delegate

they are 1.single delegate 2.multicast delegate