The relationship between Sigmund Freud and Carl Jung significantly shaped depth psychology, particularly through their divergent theories on the unconscious. Freud emphasized the importance of repressed desires and childhood experiences in shaping behavior, while Jung introduced the concept of the collective unconscious—a shared reservoir of archetypes and symbols. Their collaborative work laid the groundwork for modern psychology, but tensions arose as Jung disagreed with Freud's overemphasis on sexuality. This led Jung to develop analytical psychology, blending mythology, spirituality, and personal growth, setting a foundation for diverse psychological practices today.