It is a procedure pointer which stores the memory address of another procedure.

 

Example:-

Public Class Form1

    Inherits System.Windows.Forms.Form

 

Delegate Sub abhisek(ByVal x As Integer, ByVal y As Integer)

 

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

 

        Dim a As abhisek

        a = AddressOf rajiv

        a.Invoke(10, 20)

 

    End Sub

 

    Public Sub rajiv(ByVal x As Integer, ByVal y As Integer)

 

        Dim z As Integer

        z = x + y

        MsgBox(z)

 

    End Sub

 

End Class

 

Delegates are like a  object but it contains only reference of function member, neither it contain the copy  and reference of member variable of Class.
And Return type and signature of delegates must be same as referencing methods
Events are build up on delegate.

Delegates takes the responsiblity of another functrion