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A CV axle, also known as a constant velocity axle, is a shaft that connects the transmission to the wheels in a vehicle. It allows power to be transmitted from the engine to the wheels while also allowing for the suspension to move up and down without affecting the power delivery. The CV axle consists of a shaft with flexible joints at each end, allowing for smooth rotation and efficient transfer of power. It is an essential component in front-wheel drive and all-wheel drive vehicles.