The most widely spoken constructed auxilary language
Esperanto is estimated to be spoken natively by between 1 000 and several thousand people. The total Esperanto user base is estimated to be between 63 000 to 2 000 000 users.
Can be learnt in a day
Esperanto is defined by 16 simple rules, which can easily be learnt in a day. The grammar does not have exceptions, and many words bear similarity to Romance languages. What’s more, the letters in the 28 letter Esperanto alphabet are always pronounced the same, regardless of context.