Introversion and extroversion is a personality dimension. It was promoted by Carl Jung in the 1920s. Individual people differ on this scale. "Introverts" are quiet and shy, and "extroverts" are loud and sociable. According to the theory, introverts get energy from inside themselves (ideas and concepts in their own minds), and extroverts get energy from outside of themselves (interacting with other people). There are many concepts or understanding about introversion and extroversion that are false or myths. Such as the idea that introverts are not talkative and live their lives emotionless.