The chord comes from Microsoft's Windows 95, released in 1995 as the company's major new operating system for personal computers. Its startup sound was designed to greet users each time a machine powered on, and as millions of homes and offices adopted the system, the tone became one of the most recognisable sounds of 1990s computing. It later spread online through retro computing communities, YouTube nostalgia compilations and meme edits, where it now functions as shorthand for an earlier, more optimistic era of technology.