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Introvert, when used non-technically, usually means a shy, unsociable person. Psychiatrist Carl Jung defined introversion as a turning of mental interests away from people and events of the outer world to the inner world of one's own thoughts . 

He believed that in a normal person, introversion is balanced by extroversion . But in an introvert, the tendency toward introversion is greater than toward extroversion. Jung thought that if the tendency toward introversion became extreme, it would dominate a person's unconscious mental life and create a conflict between the two tendencies. This conflict would result in a neurosis, which is a kind of mental illness.