A CV axle (constant-velocity axle) is a driveshaft that transmits power from the transmission to the wheels while allowing the wheels to move up and down and turn. CV axles are commonly used in front-wheel-drive vehicles.
CV axles are important because they allow the wheels to move independently of the transmission, which is necessary for smooth and safe driving. CV axles also transmit power more efficiently than traditional driveshafts, which can improve fuel economy and performance.