This document provides an introduction to the field of psychology. It discusses what psychology is, which is defined as the scientific study of human behavior and mental processes. It also outlines the main goals of psychology, which are to describe, explain, predict, and control or change behavior. Several major schools of thought in psychology are then introduced, including structuralism, functionalism, psychoanalysis, Gestalt psychology, and behaviorism. The document concludes by defining what research is in psychology and noting it involves systematically investigating topics to gain new knowledge.