The purpose of the Myers-Briggs Type Indicator (MBTI®) personality inventory is to make the theory of psychological types described by C. G. Jung understandable and useful in people's lives. The essence of the theory is that much seemingly random variation in the behavior is actually quite orderly and consistent, being due to basic differences in the ways individuals prefer to use their perception and judgment.
"Perception involves all the ways of becoming aware of things, people, happenings, or ideas. Judgment involves all the ways of coming to conclusions about what has been perceived. If people differ systematically in what they perceive and in how they reach conclusions, then it is only reasonable for them to differ correspondingly in their interests, reactions, values, motivations, and skills."
Practically, the MBTI tool classifies an individual's preferences in each of the four dichotomies in Jung's theory. This classifies an individual in one of 16 possible distinctive personality types that result from the interactions among the preferences.
Jung's four dichotomies are;
The 16 personality types of the Myers-Briggs Type Indicator® instrument are listed here as they are often shown in what is called a "type table."