This study aims to examine the foundational theories, models, and assessment tools of emotional intelligence (EI), focusing on their practical applications in organizational settings. The research conducts a thorough narrative review, analyzing existing literature from key academic databases to identify the strengths and limitations of different EI models. The findings highlight ExzI's significant role in enhancing leadership, teamwork, and employee well-being. By critically evaluating various measurement tools, the study underscores the importance of selecting appropriate EI assessments to inform academic and professional frameworks. The outcomes of this research offer valuable insights for improving EI training programs and integrating emotional competencies into leadership development and organizational strategies.