Universal joints are mechanical components used to transmit torque and rotational motion between shafts that are not in a straight line with each other. They consist of two yokes or forks connected by a cross-shaped pivot or bearing, which allows for movement in multiple directions.

Universal joints are commonly found in automotive drivetrains, where they are used to transfer power from the engine to the wheels while accommodating the movement of the suspension system. They are also used in industrial machinery, agricultural equipment, and various other applications where there is a need to transmit rotational motion between misaligned shafts.