Psychology evolved out of both philosophy and biology. Discussions of these two subjects date as far back as the early Greek thinkers including Aristotle and Socrates. The word psychology is derived from the Greek word psyche, meaning 'soul' or 'mind.'
Today, psychologists prefer to use more objective scientific methods to understand, explain and predict human behavior. Psychological studies are highly structured, beginning with a hypothesis that is then empirically tested. The discipline has two major areas of focus: academic psychology and applied psychology. Academic psychology focuses on the study of different sub-topics within psychology including personality, social behavior and human development. These psychologists conduct basic research that seeks to expand our theoretical knowledge, while other researchers conduct applied research that seeks to solve everyday problems.