The Skype incoming call sound comes from Skype, the internet calling and video chat app that became hugely popular during the 2000s and 2010s. As Skype spread across home computers, offices and long-distance calls, its ringtone became instantly recognizable. Online, the sound is still used as a shorthand for incoming calls, remote work, online classes and throwback tech humor. It remains popular because a single ring quickly tells viewers what is happening, even before any screen recording, webcam frame or desktop scene appears.