ClassDojo is a classroom management app where teachers award positive points for participation, effort and good behaviour, and this chime is the sound that accompanies that reward. Because many students and teachers hear it during the school day, it quickly became a familiar shorthand for approval outside the classroom too. Creators in social media and school videos now reuse the loud version to mark wins, correct answers and wholesome moments, keeping it popular because listeners instantly connect it with praise and encouragement.