A Four-Bar Linkage is a mechanical system consisting of four rigid links connected by four revolute pairs. It typically includes a fixed frame, a moving link, and two additional links that connect the moving link to the frame. This configuration allows for a wide range of motion and is commonly used in various machines and mechanisms. The four-bar linkage is a fundamental concept in mechanical engineering and robotics, often used in applications like robotic arms, automotive suspensions, and cranes. Its design enables the transformation of rotary motion into linear motion, making it essential for creating efficient mechanical systems.