He explains the concept of the Cartesian body in which he states that there is a certain connection between the mind and the body. The mind does not necessarily need imagination to think, but the body is somehow linked to imagination. It explains many connections between the mind and body. He gives examples like if he was hungry, his mind would tell his body to eat something. These types of examples make him understand that the mind and body work in parallel. But the mind is distinct from the body, because Descartes' existence is a thinking thing independent of the body and Descartes' body is an extended thing independent of the mind. He therefore concludes that as a thinking thing he can exist without a body. But the mind and body are combined to form one unit. This brings him to the idea of ​​Cartesian dualism, which is mind-body dualism. If we use our minds carefully, we can avoid judgments that consist of errors. Additionally, it explains the existence of external material things. He proves this by explaining that he believes in the existence of external material things thanks to his senses. God created it with this nature and since God is not a deceiver, material things exist and contain the properties necessary to