Wikipedia. A constructed or artificial language—known colloquially or informally as a conlang—is a language whose phonology, grammar, and/or vocabulary have been consciously devised by an individual or group, instead of having evolved naturally. There are many possible reasons to create a constructed language: to ease human communication (see international auxiliary language and code); to bring fiction or an associated constructed world to life; linguistic experimentation; celebration of one's aesthetic tastes in language; and language games.
The synonym planned language is sometimes used to refer to international auxiliary languages and other languages intended for actual use in human communication. Some prefer it to the more common term "artificial", as that term may have pejorative connotations in some languages. For example, few speakers of Interlingua consider their language artificial, since they assert that it has no invented content. While this is not true of Esperanto and Ido, some speakers of these languages also avoid the term "artificial language" because they deny that there is anything "unnatural" about the use of their language in human communication. (In Esperanto itself, the equivalent of English "artificial" does not have the same pejorative connotation, having more connection with the concept of "art".) Some philosophers such as François Rabelais have argued that all human languages are conventional or artificial.
Calling languages "planned" also addresses a difficulty with the term "constructed language": a few languages are loosely grouped under this heading as a result of shared history and uses but are not, by their proponents, themselves viewed as constructed. Interlingua's vocabulary is taken from a small set of natural languages with much less phonological modification than in Esperanto or Ido, and its grammar is based closely on these source languages, even including a certain degree of irregularity; its proponents prefer to describe its vocabulary and grammar as standardized rather than invented.
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