Discuss Rene Descartes' metaphysical dualism as opposed to both monism and pluralism?

Descartes' dualism stated that the mind and body were distinct and occupied different planes of reality. A monism theory of reality believes that there is only one reality, and would state that the mind and body are connected. Pluralism believes that there are many realities, not just two, so the mind and body might be distinct, but there would also be other planes of reality.