This document provides an introduction to organizational behavior (OB). It defines OB as the study of how individuals and groups act in organizations, with the goal of applying this knowledge to improve organizational effectiveness. The document discusses that OB encompasses individual and group behavior, and is influenced by organizational structure, technology, people, and the external environment. It also notes that OB is important because it can help improve productivity, reduce absenteeism, increase job satisfaction, and help managers make better decisions by understanding employee behavior.