I searched the "tourism"s definition.
Dictionary defines "the business activity connected with providing accommodation, services and entertainment for people who are visiting palace for pleasure". On the other hand, the World Tourism Organization defines tourist as people"traveling to and staying in places outside their usual environment for more than one consecutive year for leisure, business and other purposes.
The most visited countries by international tourist arrivals is France. The next is USA. However, I've never been to there.
Anyway, I'm really excited now because I'm interested in this topic!!!