CV joints, or constant velocity joints, are essential components in a vehicle's drivetrain. They allow power to be transferred from the transmission to the wheels while accommodating the up-and-down motion of the suspension and the steering movement. This flexibility is crucial for maintaining smooth and efficient operation, especially in front-wheel drive and all-wheel drive vehicles. There are two main types of CV joints: ball joints and tripod joints. Ball joints are commonly used in most vehicles due to their ability to handle high angles of movement, while tripod joints are often found in applications requiring less angular flexibility. Proper maintenance of CV joints is vital for vehicle performance and safety.