An all-terrain vehicle (ATV), also known as a quad, quad bike, three-wheeler, four-wheeler or quadricycle 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. The rider sits on and operates these vehicles like a motorcycle, but the extra wheels give more stability at slower speeds.
Based on the definition found on Wikipedia: https:a//en.wikipedia.org/wiki/All-terrain_vehicle