Delgates?????

Im looking for further explanation into this concept.

Ill be using the code below for my questions. It looks to me as the use of delegates allows you to declare many objects and latter when used call there methods?

This is example 2 in the delgates tutorial in vs.net

// compose.cs
using System;

delegate void MyDelegate(string s);

class MyClass
{
public static void Hello(string s)
{
Console.WriteLine(" Hello, {0}!", s);
}

public static void Goodbye(string s)
{
Console.WriteLine(" Goodbye, {0}!", s);
}

public static void Main()
{
MyDelegate a, b, c, d;

// Create the delegate object a that references
// the method Hello:
a = new MyDelegate(Hello);
// Create the delegate object b that references
// the method Goodbye:
b = new MyDelegate(Goodbye);
// The two delegates, a and b, are composed to form c,
// which calls both methods in order:
c = a + b;
// Remove a from the composed delegate, leaving d,
// which calls only the method Goodbye:
d = c - a;

Console.WriteLine("Invoking delegate a:");
a("A");
Console.WriteLine("Invoking delegate b:");
b("B");
Console.WriteLine("Invoking delegate c:");
c("C");
Console.WriteLine("Invoking delegate d:");
d("D");
}
}