sentences:  Drivetrains where power can be sent to all four wheels are referred to as either four-wheel drive (4WD) or all-wheel drive (AWD).The "front-engine, four-wheel drive" layout (abbreviated as F4 layout) places the engine at the front of the vehicle and drives all four roadwheels.This layout is typically chosen for better control on many surfaces, and is an important part of rally racing as well as off-road driving.