Psychological Types published in 1921, is one of the best known of C. G. Jung books. In this seminal work, describing first notions that have then become part of common language, Jung has certain structures and mechanisms of typical operation of the psyche, thus seeking to promote human unmejor understanding of both himself as his neighbor.

The opposition between types not only plays an important role in theological polemics and scientific, cultural and philosophical disputes, but also in human relations in general. Of special interest are the analyzes by Jung dedicated to Friedrich Schiller, Carl Spitteler or William James.

The last chapter contains the definitions, developed by Jung himself, of psychological concepts most commonly used in his writings. Appendix includes the 1913 conference "On the question of psychological types," in which the author based much of the reflections of this volume.