What is the industry of tourism?

Exactly that, The Tourism industry.

Tourism, international tourism industry is called, is by virtue of tourism resources andfacilities, expertise, or mainly engaged in soliciting and receiving tourists, providingtransportation, sightseeing, accommodation, dining, shopping, entertainment and other six aspects of the integrated industry. Tourism business to have three parts: tourism, transport and passenger transport to the hotel accommodation industryrepresented. They are the three pillars of the tourism industry.