Psychology is the scientific study of human and animal behavior with the goal of understanding why living beings behave as they do. It includes both pure psychology, which conducts research to understand behavior, as well as applied psychology, which uses psychological knowledge to solve practical problems. Some areas of psychology include developmental psychology, physiological psychology, animal behavior, educational psychology, cognitive psychology, and the study of personality and emotion. Psychology is distinct from but related to other fields like psychiatry, neuroscience, and ethology.