Manpower planning is an important part of business planning that aims to ensure the right number and type of employees are available at the right time. It involves forecasting future human resource needs and developing strategies to meet those needs. Manpower planning can be done on a macro level for national economic development or on a micro level for individual organizations. It is affected by factors like working hours, production processes, and employee performance and productivity. Benefits of effective manpower planning include facilitating recruitment, developing employees, reducing costs, and improving business and industrial relations.