A cruise ship or cruise liner is a passenger ship used for pleasure voyages, where the voyage itself and the ship's amenities are a part of the experience, as well as the different destinations, i.e., ports of call, along the way. Transportation is not the only purpose of cruising, particularly on cruises that return passengers to their originating port, with the ports of call usually in a specified region of a continent. There are even "cruises to nowhere" or "nowhere voyages" where the ship makes 2–3 night round trips without any ports of call.
By contrast, dedicated transport oriented ocean liners do "line voyages" and typically transport passengers from one point to another, rather than on round trips. Traditionally, a liner for the transoceanic trade will be built to a higher standard than a typical cruise ship, including higher freeboard and stronger plating to withstand rough seas and adverse conditions encountered in the open ocean, such as the North Atlantic. Ocean liners also usually have larger capacities for fuel, food, and other stores for consumption on long voyages, compared to dedicated cruise ships, but they no longer exist with the exception of some preserved liners and Queen Mary 2 when on scheduled North Atlantic voyages.