QR codes are everywhere nowadays, from rental bikes to trains, posters, and more. Once upon a time in iOS, you had to download and open an app to scan a QR code, but a few years ago Apple integrated it into the camera app to make life easier for all of us!
@rosemaryorchard I needed this earlier this summer 😉 (I did eventually find somewhere that explained it, just full of junk and ads)
@smokey Urgh, I hate that!