Chain & Sprocket System:- A sprocket is basically a toothed wheel which fits onto the shaft. It is prevent from rotation on to the shaft by the keyways in the shaft and sprocket.
A chain is used to connect two sprocket each other with them, one sprocket is called the driver sprocket and the other one is called driven sprocket. Transmission of force and motion via over the chain to the one sprocket to another one, so therefore from one shaft to another shaft. Transmission of force and motion via chain to one sprocket to another one this process is called the power transmission chains.