A pivot joint is a type of synovial joint that allows for rotational movement around a single axis. This joint structure consists of a cylindrical bone that rotates within a ring-shaped bone or ligament. An example of a pivot joint is the connection between the atlas and axis vertebrae in the neck, which enables the head to turn from side to side. Another common example of a pivot joint is the radioulnar joint in the forearm, where the radius and ulna bones allow for the rotation of the wrist. Pivot joints are essential for various movements, providing flexibility and range of motion in specific directions.