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 mobility. Ball joints are commonly used in various applications, including vehicles, where they connect the suspension system to the wheels, allowing for smooth movement over uneven surfaces. In addition to automotive uses, ball joints are also found in robotics and machinery, where they facilitate movement and articulation. Their design helps reduce friction and wear, making them essential for maintaining the functionality of moving parts in systems like automobiles and robotic arms.