You might think Lord of the Rings' Elvish, Star Trek's Klingon and Game of Thrones' Dothraki are all just collections of silly words, but nope. They're actual, real languages, no different from English, Spanish or Japanese.
This TED Talk by John McWhorter explains why this is. It's not just a collection of words that makes a constructed language - or conlang - it's grammar. Structure. Evolution.
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So the next time you go to put Dothraki on your CV, don't hesitate. It's not an embarrassment, it's a skill.
Are Elvish, Klingon, Dothraki and Na'vi real languages? [YouTube, via Laughing Squid]