This sound is associated with WhatsApp, the messaging app launched in 2009, and it spread widely because millions of users hear it every day on phones and in screen recordings. Online, creators use the alert tone as shorthand for a new message without needing to show much context. It remains popular because the cue is immediate, recognizable and useful in edits built around texting, status updates and message-based punchlines. Related notification sounds include the standard Whatsapp tone and the Whatsapp notification variant.