Microsoft introduced this unlock chime with Windows 8 in 2012 and kept a similar login sound in Windows 10 in 2015, as part of the system's clean, minimal audio design. Unlike the longer startup sounds from earlier Windows versions, it was made to be quick and unobtrusive for everyday sign ins. Clips of the sound spread through YouTube tutorials, tech forums and soundboards, where creators pair it with the error sound and other system effects. It remains popular because millions recognise it instantly from school, work and home computers.