Interface

Question

 interface Ij

    {

        void m();

    }

    class h : Ij

    {

        public void i()

        {

            Console.WriteLine("iiii");

        }

        public void m()

        {

            Console.WriteLine("mm");

        }

    }

    class Program

    {

        static void Main(string[] args)

        {

            h obj = new h();

            obj.i();

            obj.m();

            Console.ReadLine();

        }


In the above Interface program why we need to go for Interface "Ij" ? Directly we can go for "h" know? and that too we cannot create object for interface... what is it's purpose?            Please explain me friends....................... I am a learner.