Centaur is a kind of Centaur monster in Greek mythology. Their upper body is the human torso, including hands and head, and the lower body is the horse body, which also includes the trunk and legs.
There are many famous centaurs in Greek mythology. They are generally described as rough, violent and unreasonable. On the contrary, they are represented as barbarians. But there are also a few (such as Chiron) who are very knowledgeable and educated.
Some people think that centaurs are the reflection of the nomads from Central Asia by the Greeks who did not see cavalry at that time. Centaurus in the sky on behalf of the constellation is Centaurus.
Source: @michal_y