This document defines key concepts related to emotions and moods in an organizational context. It discusses the relationship between affect, emotions, and moods, noting that emotions are brief and directed while moods are more diffuse. Basic emotions and aspects of emotions like biological factors are also covered. The document then examines sources of emotions and moods, constraints on expressing emotions in different cultures, and the concept of emotional labor. It introduces affective events theory and emotional intelligence, discussing applications of emotions and moods in areas like selection, decision making, and customer service. The document concludes by noting practical and ethical limits of emotions at work and their impact on performance.