Emotional intelligence (EI) is now widely acknowledged as a crucial factor in comprehending human behavior, especially in social and academic settings. Salovey and Mayer define EI as the capacity to recognize, understand, control, and govern one's own and other people's emotions. This book explores the historical evolution, importance, and practical uses of EI, with a specific emphasis on the fields of education and healthcare, and the development of a theory on the relationship of EI and stress levels of nursing students. The book examines the crucial significance of EI in both educational and healthcare environments. It emphasizes the significance of teachers possessing high EI in order to create supportive learning environments and efficiently manage classrooms. Likewise, healthcare personnel that possess a high level of EI are more capable of managing the emotional challenges that come with their positions, resulting in enhanced patient care and stronger professional connections. The book concludes by considering future research directions in EI, such as its integration with mindfulness, resilience, and the potential of advanced technologies like AI and machine learning to evaluate and enhance EI.