Difference b/w Thread and ThreadStart

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C#5.0

Hi,I am learning threading concepts and I could not make out the difference b/w Thread and ThreadStart. Below is my code....

class Alpha
    {
        public void Beta()
        {
            for (int i = 0; i < 5;i++ )
            {
                Console.WriteLine("Alpha.Beta is running its own thread.......");
            }

        }
    }

public class Simple
    {
        public static int Main()
        {
            Console.WriteLine("Thread Start/Stop/Join Sample");

            Alpha oAlpha = new Alpha();

// Thread oThread = new Thread(new ThreadStart(oAlpha.Beta));
Thread oThread = new Thread(oAlpha.Beta);
oThread.Start();
while (!oThread.IsAlive);
Thread.Sleep(1);

oThread.Join();
          Console.WriteLine();
          Console.WriteLine("Alpha.Beta has finished");

Console.ReadKey();
           return 0;
       }

both of the underlined statements are giving the same result... can some explain the difference between "new Thread(something) and new Thread(new ThreadStart(something))"