An anchor chain is a heavy chain that connects the anchor to the boat or ship. The other end of the chain is secured to the ship’s structure by a rigging hardware which enables easy slipping of the chain to sea. The chain is heavy and abrasion resistant from coral, sharp rocks, or shellfish beds.
Large ships use only chain for connecting the vessel to the anchor, but smaller ones use a combination of rope and chain to save weight. A combination rode should be arranged in a way that the rope part suspends in water (and not be in contact with the sea bed).