The label extraversion refers to a personality type that is outgoing, highly social, energetic, and talkative.These are people who need external stimulation and are unhappy in solitary situations and pursuits.
This is the opposite of "introversion," a personality type that prefers isolation and a tendency towards reserved and solitary behavior. These are people who are happy with their own company and who often have little interest is social interaction.
Extraversion and introversion are considered the opposite ends of a continuum of personality types. Closely studied in psychology since Jung, the evaluation of personality types has given rise to multiple schools of thought: the Big Five model, Jung's analytical psychology, Hans Eysenck's three-factor model, Raymond Cattell's 16 personality factors with these personality types being included in several mental assessment methods including the Meyers-Briggs Type Inventory and the Minnesota Multiphasic Personality Inventory.