How do the concepts of res cogitans and res extensa interact in the philosophy of Descartes?

In Descartes' philosophy, res cogitans refers to the mind or thinking substance, while res extensa refers to the physical world or extended substance. Descartes believed that these two concepts interact through the mind-body dualism, where the mind and body are separate but can influence each other. The mind, as a thinking substance, can perceive and interact with the physical world through the body, which is an extended substance. This interaction forms the basis of Descartes' understanding of the relationship between the mind and body.