What is the difference between a U-joint and a CV joint?

A U-joint, or universal joint, is a mechanical connection that allows for the transmission of torque and rotation between two shafts at an angle, primarily found in older vehicles and applications with less angular displacement. In contrast, a CV joint, or constant velocity joint, is designed to maintain a constant rotational speed and accommodate greater angles, making it ideal for front-wheel drive vehicles and applications with more extreme angles. While U-joints can handle a limited range of motion, CV joints offer smoother operation and better performance in dynamic conditions.