What is the difference between monotheism, polytheism and monism

Question asked:What is the difference between monotheism, polytheism and monism?

My answer:

Monotheism is the doctrine or belief that there is only one god.

Polytheism is the belief or worship in more that one god

Monism is the theory or doctrine that denies the existence of a distinction or duality of a particular sphere like matter and mind or God and the world