jungian summary   (link)

http://socionics.com/main/types.htm
According to Jung's theory of psychological types we are all different in fundamental ways. One's ability to process different information is limited by their particular type. These types are sixteen.

People can be either Extroverts or Introverts, depending on the direction of their activity; Thinking, Feeling, Sensing, Intuitive, according to their own information pathways; Judging or Perceiving, depending on the method in which they process received information.