Esperanto is the most widely spoken constructed international language. It was created by L.L Zamenhof, working under the pen name Doktoro Esperanto, as an easy-to-learn language that would be politically neutral and transcend nationality, in order to foster peace and international understanding between people with different languages.
There are estimated to be anywhere between 10,000 and 2 million active speakers worldwide, concentrated mainly in Europe, East Asia, and South America. The first World Congress of Esperanto was organized in France in 1905, and has been held annually ever since, in various countries (except in the years of the two world wars). Esperanto was recognised in 1954 by UNESCO. There is some evidence that learning Esperanto may provide a superior foundation for learning other languages.