Differential psychology is a branch of psychology that focuses on the study of individual differences in various psychological traits and characteristics, such as intelligence, personality, and abilities. Researchers in this area investigate how and why people differ in their cognitive and emotional functioning, and how these differences impact various aspects of their lives. Differential psychology encompasses a wide range of topics and theories, including the measurement of individual differences, the development of traits over time, and the role of genetics and environmental factors in shaping these differences. This field of study is important for understanding human diversity and predicting individual outcomes in various domains, such as education, work, and health.