Emotional intelligence refers to the ability to reason with and manage emotions in four areas: perceiving, using, understanding, and managing emotions. Daniel Goleman defined it as monitoring one's own and other's emotions, discriminating among them, and using this information to guide thinking and actions. People with higher emotional intelligence have a greater ability to manage feelings and deal with others effectively, leading to a happier life. Improving emotional intelligence involves skills like self-awareness, managing emotions, empathy, communication, and conflict resolution. It takes time and patience to develop these skills and improve emotional intelligence.