Write short notes on Revolute Joint (with reference to robotics).

A revolute joint, also known as a rotational or hinge joint, allows links of a robot to rotate around a fixed axis. This type of joint provides angular movement, enabling rotational motion similar to how a human elbow or knee works. Each revolute joint has one degree of freedom, meaning it provides rotation around only one axis (horizontal or vertical). The rotation is controlled by motors, such as servo or stepper motors, which regulate the angle, speed, and direction of movement. These joints are widely used in robotic arms, humanoid robots and industrial robots for tasks like welding, painting or assembly.