A chain drive is a mechanical system that transmits power between two rotating shafts using a chain. This system consists of a series of interconnected links that engage with sprockets, allowing for efficient movement and torque transfer. Chain drives are commonly used in various applications, including bicycles, motorcycles, and industrial machinery. One of the main advantages of chain drives is their ability to handle high loads while maintaining a compact design. They are also relatively easy to maintain and can be adjusted for tension. However, they may require regular lubrication to reduce wear and prevent rust, ensuring smooth operation over time.