越野型沙滩车，或称三/四轮摩托车，是一种低压轮胎车辆，通常有一个座位（有时也有两个座位），驾驶者可以控制车把。其字面上为：「适合所有地形之交通工具」（翻译自All Terrain Vehicle，缩写为ATV）。顾名思义，它比其他的车辆适合更多的地形。尽管有些国家全地形车可以在道路行驶，但是大部分国家并非合法道路交通工具。

驾驶者操控全地形车的方法如同摩托车，在低速时额外的轮子使车身更稳定。通常为三轮或者四轮，某些特殊应用也有六轮设计。

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. 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.