Tourism is travel for recreational, leisure or business purposes. The World Tourism Organization defines tourists as people who "travel to and stay in places outside their usual environment for more than twenty-four hours and not more than one consecutive year for leisure, business and other purposes not related to the exercise of an activity remunerated from within the place visited". Tourism is a popular global leisure activity. In 2008, there were over 922 million international tourist arrivals, with a growth of 1.9% as compared to 2007. International tourism receipts grew to US$944 billion (euro 642 billion) in 2008, corresponding to an increase in real terms of 1.8%.
Tourism has been described as the world’s largest industry in terms of numbers of people involved in one way or other. Tourism encompasses all the Hospitality industry.
- Tourism Categories
- Travel and tourism study
- Hotels and Catering
- Leisure and Leisure Study
- Wildlife Management
Other service industries that relate with tourism include transportation services, such as airlines, cruise ships and taxis, hospitality services, such as accommodations, including hotels and resorts, and entertainment venues, such as amusement parks, casinos, shopping malls, various music venues and the theatre.
Due to the important role played by tourism in the Social economic dynamics there are Universal and national organization that play major in development of sustainable tourism
Examples of this are:
Another category of tourism organization are either governmental or Non governmental agencies that champion for both Culture and nature conservation such as the following are: | 
