This sound is the new message alert used by MSN Messenger during the 2002 to 2005 era. It became memorable through everyday desktop chatting, long before smartphone notifications took over. Online creators still use it because it immediately signals instant messaging and evokes the look and feel of early web culture. Even in modern edits, the sound remains useful as a quick shorthand for incoming messages, online friends, and awkward conversations popping up at exactly the wrong moment.