This document provides an overview of the history and development of psychology. It discusses how psychology originated from the study of the soul, then progressed to studying the mind and consciousness. Experimental laboratories were established but these approaches were limited. Psychology then began to be defined as the scientific study of behavior, including both overt and covert behaviors. Current definitions describe psychology as the scientific study of behavior and mental processes. The document also outlines the main branches of psychology, distinguishing between pure psychology which studies topics like development and social psychology, and applied psychology with fields like educational and clinical psychology.