A ball joint is a type of mechanical connection that allows for rotational movement in multiple directions. It consists of a spherical head (the ball) that fits into a socket, enabling flexibility and articulation. Ball joints are commonly used in various applications, including automotive suspension systems, where they connect the steering knuckles to the control arms, allowing for smooth movement of the wheels. In addition to vehicles, ball joints are also found in machinery and robotics, providing essential movement capabilities. Regular maintenance of ball joints is important, as wear and tear can lead to decreased performance and potential safety issues in related systems, such as automotive or industrial machinery.