Conlanging is like playing make-believe with language. You know how you might pretend to speak a made-up language with your friends, for fun? (Like saying “jabberwocky micaloo” and pretending it means “hello”.) Conlanging is like doing that, but taking the pretend language really seriously.
You see, some people really like creating their own languages—just like how artists like painting or musicians like writing songs. They spend lots of time thinking about how words should work, and what sort of sounds and grammar rules they should have. If you’ve ever tried to invent your own language, then you know how it’s kind of hard and takes a long time! But for people who enjoy it, it’s a fun and creative thing to do.
Some people who conlang might create languages for their favorite fictional worlds, like inventing a language that hobbits might speak in Lord of the Rings. Others might create a language that’s inspired by a real language, but with their own personal twist—like making up a version of Spanish that’s spoken by bear people, or something.
Overall, conlanging is just a way for people to use their imagination to make something really unique and special, a new language that no one else in the world has ever spoken before.