Carl Jung is the psychologist who divided all personalities into introverts and extraverts.

Explanation:

Carl Jung was a Swiss psychiatrist and psychoanalyst who developed the concept of introversion and extraversion as part of his theory of personality. He believed that individuals have different ways of relating to the world and that these differences can be understood through the concepts of introversion and extraversion.

Introversion:
- Introverts are more focused on their internal world of thoughts, feelings, and ideas.
- They tend to be reflective, reserved, and prefer solitary activities.
- They may be more comfortable and energized by spending time alone or in small groups.
- Introverts may appear quiet, shy, or introspective.

Extraversion:
- Extraverts are more focused on the external world of people, objects, and events.
- They tend to be outgoing, sociable, and enjoy being around others.
- They may be energized by social interactions and seek out new experiences.
- Extraverts may appear talkative, confident, and assertive.

Jung's Personality Types:
- Jung believed that everyone has both introverted and extraverted tendencies, but one is typically dominant.
- He developed a theory of personality types based on the combination of introversion and extraversion with other psychological functions, such as thinking, feeling, sensing, and intuiting.
- For example, someone could be an introverted thinker, an extraverted feeler, or an extraverted intuitive.
- Jung's theory of personality types has been influential in the field of psychology and has been used in various personality assessments, such as the Myers-Briggs Type Indicator (MBTI).

In conclusion, Carl Jung was the psychologist who divided all personalities into introverts and extraverts. He believed that individuals have different ways of relating to the world, and these differences can be understood through the concepts of introversion and extraversion.