The theoretical perspective of personality that classifies individuals into distinct, broad categories based on specific physical body builds, physiological traits, or psychological characteristics is known as:

Understanding Type Theory of Personality: Type Theories attempt to classify human personalities into specific, discrete groups or categories based on observable physical characteristics, body types (somatotypes), or dominant psychological dispositions. Physical/Physiological Basis: Theorists like William Sheldon categorized personalities based on body types (Endomorph, Mesomorph, Ectomorph), while Ernst Kretschmer classified them into Pyknik, Athletic, and Asthenic types. Psychological Basis: Theorists like Carl Jung classified individuals into distinct psychological types—such as Introverts and Extroverts—which later formed the basis for instruments like the Myers-Briggs Type Indicator (MBTI).