The sound comes from Apple's original iPhone keyboard on early iOS, where each key press played a soft click to mimic a physical keyboard and confirm the tap registered. As iPhones spread after 2007, that tick became a universal shorthand for mobile typing in films, ads and online videos. Creators kept sampling the clean isolated click long after default settings changed, often pairing it with other interface cues like a Discord notification in chat edits. It remains popular because audiences recognise the typing action instantly, even across languages and without seeing the device.