all-terrain vehicle; ATV; quad bike
Refers to a vehicle designed for off-road use, often with four wheels and a straddle seat.
Riding an ATV on mountain trails is fun.
We use an all-terrain vehicle on the farm.
オフロード車 is a broader term for any off-road vehicle, while 全地形対応車 specifically refers to ATVs or quad bikes.
Compound of 全 (all), 地形 (terrain), 対応 (correspondence, handling), and 車 (vehicle). A direct translation of the English 'all-terrain vehicle'.