An all-terrain vehicle (ATV), also known as a quad, quad bike, four-wheeler or quadricycle as defined by the American National Standards Institute (ANSI) is a vehicle that travels on low-pressure tires, with a seat that is straddled by the operator, along with handlebars for steering control. As the name implies, it is designed to handle a wider variety of terrain than most other vehicles. Although it is a street-legal vehicle in some countries, it is not street-legal within most states and provinces of Australia, the United States or Canada.

By the current ANSI definition, ATVs are intended for use by a single operator, although some companies have developed ATVs intended for use by the operator and one passenger. These ATVs are referred to as tandem ATVs.

The rider sits on and operates these vehicles like a motorcycle, but the extra wheels give more stability at slower speeds.

Although most are equipped with three or four wheels, here's one with three (the three-wheeler ATV):

six-wheel models exist usually, for specialized applications:

Uses of ATVs vary significantly. ATVs using tracks instead of wheels are used at France's Cap Prudhomme in Antarctica.

ATVs are also used in agriculture to bridge the advantages of trucks and tractors. Also, they are used in a variety of industries for their maneuverability and off-roading ability. These include:

border patrol, construction, emergency, medical services, land management, law enforcement, military, mineral exploration, oil exploration, pipeline transport, search and rescue, small-scale forestry, surveying, wild land fire control.

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