Explain the following concepts: mass tourism, incentive tourism and social tourism.

Mass tourism, first of all, refers to the scope of participants in tourism activities has been expanded to ordinary working people. Another meaning of mass tourism is that modern tourism activities begin to form a mass tourism model represented by organized group package tourism, and form a dominant tourism form among the general public. The so-called mass type mainly refers to that tourists, under the organization and arrangement of travel agencies, provide products and services with the help of various tourism enterprises, and complete the whole tourism activities in a planned way according to the specified time, route and activities. IncentiveTravel is English for rewarding travel. According to the definition of International Incentive Tourism Association, the purpose of incentive tourism is to help enterprises achieve a specific goal and give participants who achieve this goal an unforgettable holiday as a reward. Its types include: business meetings and tourism, overseas education and training, and rewarding people who have contributed to the company's operation and performance growth. It should be pointed out that incentive tourism is not an ordinary employee tourism, but an "unusual" tourism activity designed by the professional tourism industry with certain funds provided by business owners. Taking tourism as a reward for employees will further mobilize the enthusiasm of employees and enhance the cohesion of enterprises.