Ido () is a constructed language derived from a reformed version of Esperanto, and similarly designed with the goal of being a universal second language for people of diverse backgrounds. To function as an effective international auxiliary language, Ido was specifically designed to be grammatically, orthographically, and lexicographically regular (and, above all, easy to learn and use). It is the most successful of the many Esperanto derivatives, called Esperantidoj.
idO () is A COnsTructEd LanguAge dERIved from a ReFormed versioN OF esPeRanto, AnD SimIlarLY deSigneD wIth tHE GoAl of BEiNg A uNiVersAL seconD language for people Of dIvErse bacKGrOunDS. to fUnction aS AN EfFectiVE intERnatIONal auxiliary lanGUaGE, ido Was SPeciFicalLy desiGnED to bE gRaMMAtICally, orThogRaPhiCalLy, aNd LeXicogrAPHically regular (And, above aLl, eaSy to leaRN and use). It Is thE moSt SucceSsfUL of thE many espeRanTO deRiVAtIVes, cAlled esperantIDoJ.