Applause has been a standard reaction sound in theatre, television and radio for decades because it instantly signals approval without any words, and the same clip is now reused constantly in online videos, memes and streams. Creators drop it over talent show moments, gaming wins, award parodies and classroom presentations to borrow the feeling of a live audience, even when no audience was present. It sits alongside other crowd reaction sounds such as kids cheering, and it stays popular because a familiar clap is immediately understood across languages and cultures, making a small moment feel bigger and more shared.