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An Esperantido (plural Esperantidoj) is a constructed language derived from Esperanto. Esperantido originally referred to the language which is now known as Ido. The word Esperantido contains the affix (-ido), which means a "child (born to a parent), young (of an animal) or offspring". Hence, Esperantido literally means an 'offspring or descendant of Esperanto'.
A number of Esperantidoj have been created to address a number of perceived flaws or weaknesses in Esperanto (or in other Esperantidoj) by attempting to improve the lexicon, grammar, pronunciation, or orthography. Others were created as language games or to add variety to Esperanto literature.