What's a Conlanger?
A "conlanger" is someone who creates or constructs languages or "conlangs." Conlangs come in a wide variety although these can be divided primarily into three general areas: auxlangs or international auxiliary languages like Esperanto, engelangs or engineered languages like Ithkuil and Lojban, and artlangs or artistic languages like Sindarin or Klingon. This is just the tip of the iceberg, and these are simply some of the more widely-known examples of these respective types of conlangs. What is fascinating is the number of people engaged in language creation. For an excellent introduction and explanation of "why" people create languages, check out David J. Peterson's Conlang Manifesto. David is a conlanger's conlanger.