The document defines tourism according to several sources. The World Tourism Organization defines tourists as people who travel outside their usual environment for over 24 hours for leisure, business, or other non-work purposes. Other definitions characterize tourism as the temporary movement of people to destinations outside their normal places of work and residence, or as the interactions between tourists, suppliers, and host communities in attracting and hosting visitors. The document also discusses different types of visitors, dimensions of tourism like attractions and transportation, and recent trends toward niche tourism markets and a demand for higher quality travel experiences.