The document discusses how emotions were originally ignored in organizational behavior (OB) due to the "myth of rationality" which assumed organizations were emotion-free. It then defines key terms related to emotions like moods, emotions, affect, emotional labor, and emotional dissonance. It also discusses the difference between felt versus displayed emotions and lists dimensions that can influence emotions. Finally, it discusses how understanding emotions is important for applications in OB like ability and selection, decision making, motivation, leadership, and customer service.