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In page Aircraft carrier:

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There is no single definition of an "aircraft carrier",[citation needed] and modern navies use several variants of the type. These variants are sometimes categorized as sub-types of aircraft carriers,[2] and sometimes as distinct types of aviation-capable ships.[3] Aircraft carriers may be classified according to the type of aircraft they carry and their operational assignments. Admiral Sir Mark Stanhope, RN, former First Sea Lord (head) of the Royal Navy, has said, "To put it simply, countries that aspire to strategic international influence have aircraft carriers."[4] Henry Kissinger, while United States Secretary of State, also said: "An aircraft carrier is 100,000 tons of diplomacy."[5]