Bulk carriers are cargo ships used to transport bulk cargo items such as ore or food staples (rice, grain, etc.) and similar cargo.
Container ships are cargo ships that carry their entire load in truck-sized containers, in a technique called containerization.
Cruise ships are passenger ships used for pleasure voyages, where the voyage itself and the ship's amenities are considered an essential part of the experience.
An ocean liner is a passenger ship designed to transport people from one seaport to another along regular long-distance maritime routes according to a schedule.