The tone comes from WhatsApp, the messaging app now owned by Meta, where it serves as the default alert for an incoming message. Because the app has billions of users, the short pop became one of the most recognized notification sounds in the world. Online it escaped the phone and became a meme shorthand for unexpected news, secrets, or interruptions. Editors drop it into TikToks, reels, and comedy skits whenever a plot point should feel like it just arrived by text, which keeps the sound relevant far beyond its original function.