All humans have different traits, habits, like and dislikes. In spite of being similar in physique, our requirements and priorities of life are many unfamiliar to each other. It creates different personality types. The great Greek physician Hippocrates integrated four basic temperaments to differentiate types of personality.
According to, four temperaments is a proto-psychological theory that suggests that there are four fundamental personality types, sanguine (optimistic and social), choleric (short-tempered or irritable), melancholic (analytical and quiet), and phlegmatic (relaxed and peaceful).
In fact, there are several limitations of this theory but after much research in this area we can categorize personality in four basic types; is the amalgam of certain findings of type of personalities.