why do we use delegate

I can answer you in simple Terms,

 

When you need a task to be done but you are not available, you may appoint somone to do teh task on behalf of you, that person is called Delegates in normal life.

 

When you create a Customized control and give it to other application, when your custom control has a submit button, when that button is clicked your custom control code do no where the data to be stored all other details, so if you designed using a delegate that delegate will use the consuming application object as delegate and perform submit operation.

 

Mark as answer, if that helped you