GLaDOS is the artificial intelligence who oversees the test chambers in Valve's Portal games, first released in 2007. Her announcements are a running feature of the series, delivered in a calm, synthetic voice that mixes helpful instructions with dark humour. Short clips of her voice became popular on soundboards and in gaming videos because they are instantly recognisable even without visuals. Creators still reuse them to parody automated systems, corporate messages and in-game tutorials, keeping the character alive long after the original games.