Organizational behavior is the study of how human behavior impacts organizational performance. It examines how individuals, groups, and structures affect behavior within organizations. The field draws from psychology, sociology, communication, and management. Key contributors include Frederick Taylor with scientific management, Elton Mayo with the Hawthorne Studies, and theorists who developed models like the autocratic, custodial, supportive, and collegial models of management. Understanding organizational behavior can help improve areas like innovation, customer service, and responding to change.