The Universal Esperanto Association, also known as the World Esperanto Association, is the largest international organization of Esperanto speakers, with 5501 individual members in 121 countries and 9215 through national associations and in official relations with the United Nations. In addition to individual members, 70 national Esperanto organizations are affiliated with UEA. Its current president is the professor Duncan Charters. The magazine Esperanto is the main organ used by UEA to inform its members about everything happening in the Esperanto community.

Esperanto is the world's most widely spoken constructed international auxiliary language. Created by L. L. Zamenhof in 1887, it is intended to be a universal second language for international communication, or "the international language". Zamenhof first described the language in Dr. Esperanto's International Language, which he published under the pseudonym Doktoro Esperanto. Early adopters of the language liked the name Esperanto and soon used it to describe his language. The word esperanto translates into English as "one who hopes".