A chain coupling is a type of mechanical coupling that uses a chain and sprockets to connect two shafts and transmit torque. It consists of two sprockets mounted on the shaft ends and a chain that wraps around them to create the connection. Chain couplings are known for their ability to accommodate slight misalignments and their high torque capacity, making them suitable for heavy-duty applications. They are commonly used in industries like material handling, conveyors, and industrial machinery, valued for their simplicity, durability, and cost-effectiveness.