Esperanto, Ido, Volapük, and Toki Pona are constructed languages (conlangs) that were designed with the intention of serving as international auxiliary languages.

Esperanto is the most well-known and widely-used of these languages, with an estimated 2 million speakers around the world. It was created by L.L. Zamenhof in the late 19th century, with the goal of facilitating communication and promoting peace between people of different cultures. An example sentence in Esperanto would be: "Mi parolas Esperanton" (I speak Esperanto).

Ido was created in 1907 as a reform of Esperanto. It aimed to simplify the grammar and make the language easier to learn. However, it did not achieve the same level of popularity as Esperanto. An example sentence in Ido would be: "Me kandidatez por prezidanto" (I am running for president).

Volapük was created in the late 19th century and was one of the earliest constructed languages. It has a more complex grammar than Esperanto and did not enjoy the same level of popularity. An example sentence in Volapük would be: "Lol nulik binons pädam e kufälon" (The small child was sitting on the chair).

Toki Pona is a relatively new constructed language that was created in 2001. It has a very minimalistic grammar, with only about 120 words in the lexicon. It is designed to promote a simple and joyous way of life. An example sentence in Toki Pona would be: "Mi mute pona e sina" (I really like you).

While these languages are primarily used for recreational purposes and among language enthusiasts, there are some communities that use them for communication and cultural exchange.
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