A swivel joint is a mechanical device that allows two connected parts to rotate relative to each other while maintaining a fluid connection. It is commonly used in various applications, such as in hydraulic systems, to enable movement without causing leaks. The design typically includes a rotating element that is sealed to prevent fluid escape. These joints are essential in industries like construction, automotive, and manufacturing, where flexibility and mobility are required. By facilitating smooth rotation, swivel joints help improve the efficiency and functionality of machinery and equipment, making them vital components in many engineering applications.