The Myers-Briggs Type Indicator, otherwise known as MBTI, is a test to determine your psychological type and provide insights of type theory. Each type is consisted of four letters – Extraversion (E) or Introversion (I), Sensing (S) or Intuition (N), Thinking (T) or Feeling (F), and Judging (J) or Perceiving (P). The 16 types are listed below: