Duolingo launched in 2012 as a free language learning platform built around short lessons, streaks and instant feedback sounds. The correct answer chime became one of its most recognisable cues, and clips of longer streak versions spread on TikTok and YouTube as creators borrowed it for quizzes and challenges. It now sits alongside the classic ding sound effect in meme editing, used whenever someone wants an unmistakable audio signal for getting something right.