AOL Instant Messenger, launched by America Online in 1997, became one of the first chat services used by millions of people at home, with buddy lists, away messages, and short alert sounds for signing on and receiving messages. As home internet spread in the late 1990s and early 2000s, those sounds became shorthand for being online and waiting for friends to appear. The service closed in 2017, but its audio remains a cultural reference point, much like a modern Discord notification, because it instantly recalls a slower, more personal era of internet chat.