Travel is the general movement of human beings between geographically distant places. Travel is often done by car, bike, foot, plane, train, bus or other mode, with or without suitcase, and is usually one way or roundtrip. The earliest forms of travel involved the raising of travelers to a destination, then moving along with them, usually through dirt roads and over rugged terrain. Over time, travel has evolved into a more sophisticated method of travel, and is now facilitated by air, road, rail, sea and even virtual cell phone service. There are several different forms of travel, but each type of travel tends to be associated with one of four distinct types of transportation: land, air, sea and water.
Land travel is travel that involves travel from one location to another, generally on foot or by car. The earliest forms of land travel were probably for a single purpose – such as hunting or fishing – and were possibly limited by the terrain and local culture. Land travel can take various forms, from camping to sightseeing to long distance traveling, and is often facilitated by airports or rental cars. One of the earliest forms of travel, traveling by car, has fallen out of fashion in recent years, however, many people still enjoy the convenience and safety of driving to and from one place to another.
Air travel is travel that is either conducted by air, sea or by railroad. Air travel is by a plane, either civilian or military, and takes off from an airport. A cruise ship also provides air travel, sometimes using a rented aircraft and reserving crewed ships for passengers. The railway journey by train is one of the oldest forms of travel, and became popular with wealthy travelers around the 19th century. Trains can either be passenger or freight trains, and are a good means of travel for those who want to see a few places, but who do not wish to spend too much money.