This report delves into the critical roles of leaders and managers within the Marriott Hotel, exploring how they contribute to the organization's success. It defines and compares the distinct characteristics of leaders and managers, highlighting their functions and responsibilities. The report examines various leadership theories, including contingency, situational, and transformational leadership, and analyzes their strengths and weaknesses in different situations. It also explores the application of these theories in addressing challenges such as labor turnover and interpersonal conflicts. Furthermore, the report investigates key approaches to operational management, emphasizing the importance of leaders and managers in improving efficiencies and achieving business objectives. Finally, it considers the factors within the business environment that impact operational management and decision-making processes. The analysis includes discussions on practical examples and case studies, offering a comprehensive understanding of leadership and management in a real-world business context.