Four-wheel drive (4WD) is a vehicle system that allows all four wheels to receive power from the engine simultaneously. This feature enhances traction and stability, making it ideal for off-road driving or challenging weather conditions, such as snow or mud. Vehicles equipped with 4WD can better navigate rough terrains, providing improved control and safety. There are two main types of four-wheel drive: full-time and part-time. Full-time 4WD operates continuously, while part-time 4WD can be engaged or disengaged as needed. Many SUVs and trucks come with 4WD options, catering to drivers who require enhanced performance in diverse environments.