Thematic Apperception Test (TAT) is a projective psychological test where subjects create stories based on ambiguous images, revealing their personality traits, emotions, and conflicts. Developed by Henry Murray and Christina Morgan in 1935, TAT has a structured scoring and interpretation system focusing on the characters' needs, environmental influences, and story outcomes. Results provide insights into an individual's personality and emotional state, though they are subjective and require consideration of the subject's background.