This document provides an introduction to psychology, including definitions of psychology, the development of psychology as a field, the scope and branches of psychology, and methods used in psychology. It defines psychology as the study of the mind and human behavior. It discusses the emergence of psychology as a science in the late 19th century and describes some of its major subfields like clinical, developmental, social, and abnormal psychology. It also outlines several research methods used in psychology like observation, experimentation, introspection, testing, and clinical methods.