Extraversion/Introversion

The traits of extraversion (or extroversion) and introversion are a central dimension in some human personality theories. The terms introversion and extraversion were popularized by Carl Jung, although both the popular understanding and psychological usage differ from his original intent.

Extraversion tends to be manifested in outgoing, talkative, energetic behavior, whereas introversion is manifested in more reserved and solitary behavior. Rather than focusing on interpersonal behavior, however, Jung defined introversion as an "attitude-type characterized by orientation in life through subjective psychic contents", and extraversion as "an attitude-type characterized by concentration of interest on the external object".

Extraversion and introversion are typically viewed as a single continuum, so to be high in one necessitates being low in the other. Jung and the developers of the Myers–Briggs Type Indicator provide a different perspective and suggest that everyone has both an extraverted side and an introverted side, with one being more dominant than the other.