Charter party v. contract of affreightment

A charter party is a contract by which an entire ship, or some principal part thereof, is let by the owner to another person for a specified time or use; a contract of affreightment is one by which the owner of a ship or other vessel lets the whole or part of her to a merchant or other person for the conveyance of goods, on a particular voyage, in consideration of the payment of freight. 

A contract of affreightment may be either time charter, wherein the leased vessel is leased to the charterer for a fixed period of time, or voyage charter, wherein the ship is leased for a single voyage. In both cases, the charter-party provides for the hire of the vessel only, either for a determinate period of time or for a single or consecutive voyage, the ship owner to supply the ship's store, pay for the wages of the master of the crew, and defray the expenses for the maintenance of the ship. 

Under a demise or bareboat charter on the other hand, the charterer mans the vessel with his own people and becomes, in effect, the owner for the voyage or service stipulated, subject to liability for damages caused by negligence.