Emotions were historically ignored in organizational behavior research due to the belief that organizations should be rational and emotion-free. However, it is now understood that emotions cannot be separated from the workplace. There are basic emotions like fear, anger, sadness, and happiness, as well as more complex blends of emotions. Moods are less intense feelings that lack a specific contextual stimulus. Understanding emotions and moods can improve explanations of important organizational phenomena like decision-making, motivation, leadership, and performance.