What is unusual about Esperanto?

Answer 1

Lots of things, but the main one is that it a language that was created - a planned language. Most languages develop over hundreds of years, but Esperanto was created in the 1880's to act as a neutral "bridge" language.
Esperanto has very few native speakers, compared to other languages. It is a voluntary speech community, and most Esperanto speakers opt in rather than receiving the language from their parents.

• It was created artificially.
• It has specific rules with no exceptions, making it easy to learn.
• Use of an opposite pre-fix greatly reduces the number of words that need to be learned.
• There is no required word order.
• It is free of any nationalistic connections.

Answer 2

Esperanto is unusual because it is a constructed language designed to be easy to learn and to promote international communication. It was created by L. L. Zamenhof in the late 19th century with the goal of fostering harmony and understanding between people of different linguistic backgrounds. Despite not being the most widely spoken language, Esperanto has a dedicated community of speakers around the world.