A ball joint is a mechanical component used in various types of machinery and vehicles, particularly in automotive suspension systems. It serves as a pivot point between two parts, allowing for smooth movement in multiple directions while still providing support and stability.

In an automotive context, ball joints are typically found in the steering and suspension systems. They connect the control arms or steering knuckles to the vehicle's chassis or spindle, enabling the suspension to articulate as the wheels move over bumps and uneven terrain. Ball joints are essential for maintaining proper alignment and handling characteristics of a vehicle.

The design of a ball joint consists of a spherical bearing enclosed within a housing, often made of metal. The spherical bearing allows for rotation and movement in multiple axes, providing flexibility while maintaining structural integrity. Some ball joints are serviceable, meaning they can be lubricated and adjusted, while others are sealed and require replacement if they wear out or fail.

Overall, ball joints play a crucial role in ensuring the safe and efficient operation of vehicles by allowing for controlled movement and articulation in suspension and steering systems.