Introversion and extroversion occur on a spectrum. This means that there are different degrees of introversion. No one person is completely an introvert or completely an extrovert. Though every introvert is different, most introverts share certain traits and challenges.

In Eysenck’s personality typology, he said “The extrovert is a friendly person who seeks company, desires excitement, takes risks, and acts on impulse, whereas the introvert is a quiet, reflective person who prefers his or her own company, does not enjoy large social events, does not crave excitement, and may be seen by some as distant and remote. ”(p.28) Introverted including behavioral inhibition, loneliness, and social anxiety and retreat(Coplan & Rubin, 2010) Henderson’s definition of introversion is people who feel uncomfortable in social situations, is a fear of negative assessment, accompanied by emotional depression or suppression, and will significantly affect the participation of social activities or the pursuit of individual career goals (Henderson, 1998).