Cruise liners

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.

Although often luxurious, ocean liners had characteristics that made them unsuitable for cruising, such as high fuel consumption, deep draught that prevented their entering shallow ports, enclosed weatherproof decks that were not appropriate for tropical weather, and cabins designed to maximize passenger numbers rather than comfort (such as a high proportion of windowless suites). The gradual evolution of passenger ship design from ocean liners to cruise ships has seen passenger cabins shifted from inside the hull to the superstructure with private verandas. The modern cruise ships, while sacrificing some qualities of seaworthiness, have added amenities to cater to water tourists, and recent vessels have been described as "balcony-laden floating condominiums".

The distinction between ocean liners and cruise ships has blurred, particularly with respect to deployment. Differences in construction remain. Larger cruise ships have also engaged in longer trips such as transoceanic voyages which may not return to the same port for months (longer round trips). Some former ocean liners operate as cruise ships, such as Marco Polo. This number is diminishing. The only dedicated transatlantic ocean liner in operation as a liner of December 2013is Queen Mary 2 of the Cunard fleet. She also has the amenities of contemporary cruise ships and sees significant service on cruises

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