Sorry, missed this question until now. Conlang is short for constructed language, as in a language intentionally created by one or more people, as opposed to a natlang, i.e. natural language, which evolves slowly as a group of people just speak it without intentionally designing it. English, Turkish, Nepali, and Vietnamese are all examples of natlangs. Klingon, Na’vi, Sindarin, and Esperanto are examples of well known conlangs. But there are thousands of us who also just work on our own languages, for a variety of reasons, such as needing one for a fictional world we’re developing, or wanting to experiment with some grammatical feature that interests us, or just for our own personal use and enjoyment. I’m one of that last group.