Psychology is the scientific study of the human mind and behavior. Its purpose is to understand how people think, feel and act both individually and in groups. Psychologists use a variety of research methods and theories to investigate subjects such as personality, cognition, emotion, perception, development, and mental health. Her goal is to uncover the patterns, processes and factors that influence human behavior and mental processes. Psychology is made up of various subfields such as clinical psychology, social psychology, cognitive psychology, and developmental psychology. Insights gleaned from research in psychology are applied in a variety of contexts, including therapy, education, business, and public policy, to improve individual well-being and broaden our understanding of human nature.