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An all-terrain vehicle (ATV), also known as a quad, quad bike, three-wheeler, 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.
The ATV is more physically demanding to ride, and the rider must use balance to manipulate and control the vehicle, Kaiser says. It's fun, and they're small enough to really manhandle around, whereas a UTV is large enough that you're just strapped in and along for the ride.