Judaism is a Monotheistic religion believing in only 1 god. Polytheistic religions worship multiple gods like the Egyptians for example.The Egyptians have Pharaoh, Ra,Nut, Osiris and many more.Judaism was founded by Abraham many years ago. They follow the old testament in the bible, or the Torah. And all you really have to remember is that Poly is multiple and Mono is one.
(you may copy this answer)