AOL Instant Messenger, known as AIM, was one of the most popular chat services of the late 1990s and early 2000s, and its short notification sounds became instantly recognisable to a generation of internet users. The sent-message sound was deliberately different from the received-message sound, helping users tell outgoing and incoming chats apart without looking at the screen. As AIM faded, the clip lived on in nostalgia edits, reaction videos and retro tech compilations, where it now works like an early Discord notification, signalling an old-school online conversation in less than a second.