U-joints, also known as universal joints, are essential components found in a wide range of mechanical systems, from automobiles and industrial machinery to agricultural equipment. They provide a crucial link between rotating shafts, allowing for flexibility and misalignment while transmitting power. This article delves into the world of U-joints, exploring their various types and applications, with a focus on automotive U-joints, combination U-joints, industrial U-joints, and micro U-joints.