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Tourism refers to the practice of travelling away from your home for leisure, recreation, or business reasons. It can be subdivided into local, regional or international travel based on the distance covered from one's original residence. Indigenous sightseeing involves moving within the same country, while regional tour takes to neighboring states within the same landmass. Nevertheless, the most popular one is international travel whereby the person visits another continent either through cruise ships or chattered planes.
from: http://ezinearticles.com/?Understanding-The-Dynamic-Travel-Industry-And-Its-Hidden-Treasures&id=8245361