Video Summary: Psychological theories seek to represent abstract concepts of human behavior in more-understandable terms. Based on dynamic personality characteristics, some theories strive to predict suitability of the individual to future circumstances. Matching people's personality and interaction styles to congruent careers and educational techniques saves time, money, and frustration for everyone in the equation.
The terms "introvert" and "extravert" describe how one focuses their attention or gets their energy -- whether their source is more internal or external. This is only one of four psychological modes postulated by Carl Jung, but clearly the best known by the general public. But introverts and extroverts are not simply polar opposites along a single continuum.
While most of us have made peace with our natural tendencies, you probably have wished at times to be less like yourself and more like someone your opposite -- or at least coveted some of their traits.
Both categories have pro's and con's. Extroverts with a touch of introversion, or vice versa, tend to find more doors open to them than those at either extreme. Introverts can learn to be more chatty and spontaneous. Extroverts can learn to watch more and talk less. And whatever proclivity you acquired through your genes or upbringing is not permanent. To some extent, it is malleable and can be nudged.