People differ not only in physical appearance but also regarding attitudes, thoughts, beliefs and outlook towards life. Hence, you will encounter different types of individuals but, if you observe carefully, they may fall into various types. However, to spot and understand them, you need to know the characteristics of each personality type.
It will help in understanding yourself, interacting with others and managing them better. Popular types are the mechanic, the duty filler, the thinker, the giver, the executive and so on.
Here is a list of 10 popular books on Personality Types