What Psychology Is Why people do the things they do is an age-old question. Despite its youth, it is a broad discipline, essentially spanning subject matter from biology to sociology.
Biology studies the structures and functions of living organisms.
Sociology examines how groups function in society. As scientists, psychologists follow scientific methods, using careful observation, experimentation, and analysis. But psychologists also need to be creative in the way they apply scientific findings. Psychologists are frequently innovators, evolving new approaches from established knowledge to meet changing needs of people and societies. They develop theories and test them through their research.