Travel is the transport of people on a trip/journey or the process or time involved in a person or object moving from one location to another. Reasons for travel include:

Tourism—travel for recreation. This may apply to the travel itself, or the travel may just be the necessary investment to arrive at a desired location.
Visiting friends and family
Trade
Commuting–going to various routine activities, such as work or meetings
Migration—travel to begin life somewhere else; nomadic people do this
Pilgrimages—travel for religious reasons