Carl Jung was a brilliant innovator in the field of psychology. This paper introduces the concepts and theories of Carl Jung. The primary focus of this paper is to expose the ideas behind Carl Jung’s well-known and withstanding personality theories. This paper discusses Carl Jung’s personality theories, the background and history of these theories, and furthermore how these theories are applied to psychology and life today. Additionally this paper looks at Jung’s eight mental processes and how they are applied to the MBTI personality test. Jung’s personality theories are important and applicable in education and work, relationships, and self-awareness.