Audience applause is one of the most widely reused sounds online because it instantly communicates approval without any words. Creators use it in reaction videos, livestreams, presentations, and memes to mark a success, a comeback, or a well-timed joke, and editors often layer it over a reveal to make the payoff feel public. Its staying power comes from familiarity: listeners recognise the sound of a crowd immediately, so it needs no explanation and works across languages, formats, and platforms, from short clips to longer edited videos.