ICQ was one of the first widely used instant messaging services, launched in 1996 and popular throughout the late 1990s and early 2000s for real-time chat, buddy lists and distinctive notification sounds. As home computers spread, its short electronic tones became part of everyday online life for millions of users. Long after newer apps replaced it, clips of those sounds kept circulating in nostalgia videos, retro tech compilations and memes, where they now act as instant shorthand for the early internet era.