This document provides an introduction to outdoor recreation and tourism. It defines tourism according to the World Tourism Organization and Jafari as travel outside of one's usual environment for leisure, business, or other purposes. Factors that affect tourism are discussed, including political, social/economic, and technological factors. The requirements for classifying as a tourist are outlined as spatial (traveling outside one's usual area), temporal (no more than 1 year abroad or 6 months domestically), and purposive (for leisure, business, etc.). Different types of tourists and purposes of trips are also summarized.