Psychology is defined as the scientific study of human behavior and mental processes. There are several major psychological perspectives that study these areas, including psychoanalytic, behaviorist, cognitive, and biopsychological approaches. The field has evolved from its philosophical roots to become a science, with the goal of objectively describing, explaining, predicting, and changing human behavior and cognition. Psychologists work in a variety of settings and subfields, from research and academia to clinical practice and other applied settings. The study of psychology aims to further our understanding of human thought and behavior through empirical research.