Leisure is defined as free time that is not spent working or engaged in necessary daily activities like eating or sleeping. It involves activities done according to one's own choice and judgment during unobligated, discretionary time. Tourism, on the other hand, involves travel for purposes like holidays or business. While tourism is a part of leisure, leisure also encompasses many other areas like sports, culture, and hobbies that do not require travel. Studying leisure is important because it is concerned with how people spend their real lives and use their free time.