Reasons for traveling include recreation,[5] tourism[5] or vacationing,[5] research travel[5] for the gathering of information, for holiday to visit people, volunteer travel for charity, migration to begin life somewhere else, religious pilgrimages[5] and mission trips, business travel,[5] trade,[5] commuting, and other reasons, such as to obtain health care[5] or fleeing war or for the enjoyment of traveling. Travel may occur by human-powered transport such as walking or bicycling, or with vehicles, such as public transport, automobiles, trains and airplanes.