One of his most outstanding works is: Psychological Types (1921)

Swiss Psychologist, psychologist and essayist, founder of the school of Analytical Psychology, also called psychology of the complexes and deep psychology. He was the first to speak in terms of extraversion and introversion. He made the observation of a natural predominance: in thought, sensation, feeling, intuition. In 1923, he released the English version of the book PSYCHOLOGICAL TYPES. His first edition was in German, in 1921.

TYPE:

Structure or psychic constitution with some attributes, features and constraints which are observable.

They are clearly definable and differentiated, and expressed not only in a particular individual but can show how every human being is set apart from others with his/her own traits. Type is a characteristic model of an attitude generally present in many individuals.