Tourism is defined as activities of people traveling outside their usual environment for one year or less for leisure, business, or other purposes. It involves transportation, accommodations, attractions, and hospitality services. Tourism is a dynamic industry that requires adapting to changing customer needs. It provides economic and social benefits but also poses challenges to local environments and cultures. The document then discusses various aspects of tourism including definitions from different authors, tourism scenes and activities, tourism history relating to developments in transportation, and the relationship between tourism supply and demand.