Door chimes like this one have long been used in shops and cafes, where a small bell attached to the entrance alerts staff whenever a customer comes in. That familiar everyday sound has carried over to online videos, memes and streams, where creators use the short chime as a quick audio cue for arrivals, entrances and scene changes. Because it is instantly recognisable and only lasts a fraction of a second, it works as a light transition without interrupting dialogue or music.