Four-wheel drive
Four-wheel drive (also known as 4WD or 4×4) is a vehicle in which all the four wheels are allowed to receive torque from the engine at the same time. The term is widely associated with off-road driving. In fact, by powering all of the four wheels at the same time, a normal car has a better control on most surfaces. The term four-wheel drive describe cars in which the driver has to manually switch between two wheel drive (for streets) and four-wheel drive (for adverse conditions such as snow, ice, mud, gravel). AWD (All Wheel Drive) is a “full-time” four-wheel drive.