Pls tell me the differences between GM and Super GM!

I'm just wanted to know what is the differences between GM and Super GM. I recently watched Super GM beat another GM with an easy games. They just know something more than the others GM. For me, to beat an amateur players are really hard and I quite often end up with bad position in chess games. Wow! I'm really suprised with that. One fact that I really confused is they still can't beat a GM and how can a Super GM beat them really easily or maybe get a slight advantage in the game. This question is still mystery for me in my life... pls someone tell me how Super GM became very strong than others GM