Four-wheel drive (4WD) is a system where all four wheels of a vehicle receive power from the engine. This means that the engine power is distributed to each wheel equally, resulting in better traction and control in off-road conditions. Typically, 4WD vehicles have a transfer case and locking differentials that can provide additional power to all four wheels.
Front-wheel drive (FWD), on the other hand, is a system where the engine power is transmitted to the front wheels. This type of system provides better fuel economy, as it requires less power to operate. As a result, FWD vehicles are typically more efficient, especially in city driving where acceleration is more frequent.
Overall, the main difference between 4WD and FWD is that 4WD is more suited for off-road conditions and challenging terrain, while FWD is better for everyday driving and fuel efficiency.