What is MBTI?

The MBTI (Meyers-Briggs Type Indicator) is the most widely used personality test system used today. 

MBTI defines personality according to four characteristics:

1.  Where you get energy:   Introversion - Extroversion

2.  How you gather information:  Sensing - Intuition

3.  How you make decisions:  Thinking - Feeling

4.  How you live:   Judging - Perceiving 

Combinations of these give 16 different "personality types."

Much more detail can be found at this link:  Personality/MBTI