This chapter introduces the foundational principles of organizational behavior (OB), offering a comprehensive overview of how individuals and groups interact within contemporary organizations. It begins by defining what constitutes an organization and the key objectives of organizational behavior as a field. The chapter outlines both qualitative and quantitative research approaches used to study OB and emphasizes the applied nature of the discipline. Central themes include the role of emotions in the workplace, emotional intelligence, and how affective events shape organizational outcomes. The chapter also explores the practical implications of OB for individuals pursuing careers in various industries, highlighting the interpersonal and analytical skills necessary for success. Real-world examples, including experiential exercises and expert contributions, reinforce theoretical concepts and their relevance to workplace effectiveness. The chapter concludes by encouraging learners to connect OB theories to personal experiences and current workplace challenges.