The dial-up handshake was the sound of home internet in the 1990s and early 2000s, when computers connected through a telephone line using a modem. Each screech, beep and burst of static was the modem and the provider's server negotiating speed and protocol before a connection opened. As broadband replaced dial-up, the noise survived as a cultural shortcut for the early web, appearing in throwback videos, comedy sketches and reaction edits that contrast slow old technology with instant modern life.