This short alert comes from WhatsApp, the messaging app used by billions of people around the world for everyday chats, voice notes and calls. Because the tone plays whenever a new message arrives, it has become one of the most recognisable notification sounds on a phone, even for people who rarely open the app. Creators soon began lifting it into short videos, memes and pranks, where a single ding can suggest a conversation without showing a screen. Its familiarity is the reason it still works: listeners instantly understand the cue.