A server is a computer, or more likely a network of computers, that functions as the host of some sort of electronic media. Final Fantasy XI and Final Fantasy XIV are the only games in the Final Fantasy series to utilize servers.
All active servers in Final Fantasy XI are named after summons from earlier entries in the series. Some servers employed during the game's beta tests were named after enemies instead. Final Fantasy XI launched with twenty servers available for public use and subsequently added another fifteen. Eleven sparsely populated servers have since been decommissioned, however, leaving the game with its current roster of twenty-four. Characters on discontinued worlds were automatically transferred to other servers.
In addition to the servers listed below, worlds named Chocobo and Moogle have been used for special events and product demonstrations. Game data also specifies the existence of Behemoth, Dragon, Chimera, and Wyvern servers whose intended purposes are unknown.
All of the servers in Final Fantasy XIV will be named after famous weapons from the Final Fantasy series. The chosen weapons are all prominent weapons from the game of origin of one of the previous server names (example Wutai + Gysahl => Masamune)
Currently, they are named after towns, but this will be changed on the March 2012 server merge, due to the plan of including content based after previous games in the series - which could include naming one such content after a previous game town, for example - as well as preventing players from congregating on a single server due to it's name - with "Midgar" being used as an example of a possible server name that could become overcrowded simply due to it's name.
Test servers were named after previous Final Fantasy villains, and two internal servers called Zvahl and Narshe are closed to the public. Some of the release servers were also activated during Beta.
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