The Thematic Apperception Test (TAT) is a projective psychological test developed in 1935 consisting of ambiguous picture cards. Subjects are asked to tell stories about each picture card to assess their personality traits, attitudes, and emotional responses. The TAT aims to reveal subjects' unconscious motivations and is interpreted by examining the content, tone, and structural elements of the stories they generate in response to the cards. It provides insights into how subjects view themselves and relationships with others. The TAT continues to be widely used for individual assessments and research into human psychology and personality.