The travel industry is a massive global sector that encompasses any business catering to individuals who are temporarily away from their homes for leisure, business, or other purposes. Key sub-sectors include transportation services (airlines, cruise lines, railways, and car rentals), hospitality services (hotels, motels, and vacation rentals), and travel intermediaries (travel agencies and tour operators). Additionally, the industry includes entertainment and leisure destinations such as theme parks, casinos, and national parks. In 2026, the sector has also expanded into niche markets like medical tourism, ecotourism, and space tourism. Related fields like aviation engineering, shipbuilding, and international logistics are often considered part of the broader travel infrastructure. Collectively, these industries work together to facilitate, manage, and enhance the movement and experience of millions of people crossing domestic and international borders daily.