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A ship's tender, usually referred to as a tender, is a boat, or a larger ship used to service a ship, generally by transporting people and/or supplies to and from shore or another ship. Smaller boats may also have tenders, usually called dinghies.
For a variety of reasons, it is not always advisable to try to tie a ship up at a dock; the weather or the sea might be rough, the time might be short, or the ship too large to fit. In such cases tenders provide the link from ship to shore, and may have a very busy schedule of back-and-forth trips while the ship is in port.
On cruise ships, lifeboat tenders do double duty, serving as tenders in day-to-day activities, but fully equipped to act as lifeboats in an emergency. They are generally carried on davits just above the promenade deck, and may at first glance appear to be regular lifeboats; but they are usually larger and better-equipped. Current lifeboat tender designs favor catamaran models, since they are less likely to roll in the calm to moderate conditions in which tenders are usually used. They typically carry up to 100 to 150 passengers and two to three crew members.
Before these ships were mass-produced, the main way to board a larger ship (mainly ocean liners) was to board a passenger tender. Passenger tenders remained based at their ports of registry, and when a ship came through the area, the tender would tie up with the ship and embark passengers on an elevated walkway. These vessels were larger, had a greater passenger capacity, and a broader sense of individuality in their respective companies than the more modern tenders seen today. Because of their increased size, lifeboats and life preservers were commonplace on board these ships (with two boats being the standard amount for an average tender).
Before the technologies that allow submarines and destroyers to operate independently matured by the latter half of the 20th century - and significantly during the Second World War, they were heavily dependent upon tenders to perform most maintenance and supply. Their hull classification symbols in the US Navy were, respectively, AS and AD, while general repair ships were AR. Naval tenders fell out of use during the late 20th century, as the speed and range of warships increased - reducing the need for advanced basing. By the end of the 20th century - all of the tenders in the U.S. Navy had been inactivated except for two submarine tenders. As a result of the settlement of the lawsuits over the Suisun Bay and Estuary - the U.S. Navy and MARAD are engaged in an aggressive disposal program that will scrap all of those ships by 2017. While the Navy's plans for tenders held in reserve in other places (such as inactivated submarine tenders USS McKee and USS Simon Lake held at Inactive Ships, St. Juliens Creek Annex) weren't addressed in that lawsuit, since its settlement, the Navy has indicated its desire to dispose of such ships as soon as possible.
Apparently not completely willing to wean itself from tenders all together - but with an eye towards reducing costs - the last two tenders remaining in active service have now been operationally turned over to the Military Sealift Command. Emory S. Land-class submarine tenders USS Emory S. Land and USS Frank Cable are now manned and operated by a "hybrid" crew. The Captain and a couple hundred technicians are regular Navy; while the operation of the ship itself is performed by Merchant Marines. Prior to the turn-over both ships had more than 1000 sailors. While at this time the ships still bear the AS classification - both ship's primary mission has been expanded well beyond submarines to include service and support of any Naval vessel in their operational area. Under the traditional Navy classification both ships should be reclassified as AR (Auxiliary Repair) - however - since now operated by the MSC - it's doubtful such a reassignment will occur. Emory S. Land is forward deployed in the Indian Ocean at Diego Garcia - while Frank Cable is forward deployed in the Pacific at Polaris Point, Apra Harbor, Guam: such forward deployments are to provide service and support at the very great distances of the Western Pacific.
Two tenders, SS Nomadic and SS Traffic, were built for the White Star Line by Harland and Wolff to serve the liners RMS Olympic and RMS Titanic at Cherbourg. Nomadic survives as a museum ship, and is the last remaining vessel built for the White Star Line still afloat.
Types of tenders 
- Armed tender, British supply or transport ships that were outfitted and commissioned for military use in the Naval Service.
- Buoy tender, used to maintain navigational aids.
- Destroyer tender, a large ship used to support a flotilla of destroyers or other small warships.
- Dive tender, a ship or boat used to support the actions of divers. Also known as a diving support vessel.
- Lighthouse tender, used to tend lighthouses and, later, buoys.
- Luxury yacht tender, a small boat used on luxury yachts.
- Motor torpedo boat tender, a mobile base and supply ship used to support motor torpedo boats on operations during World War II.
- Seaplane tender, a ship carrying multiple seaplanes. Also known as a seaplane carrier, and considered to be a predecessor to the aircraft carrier.
- Submarine tender, a large ship used to support a flotilla of submarines.
- Torpedo boat tender, a ship used during the late 19th and early 20th centuries to carry torpedo boats to sea and deploy them against enemy ships
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