modern-day versions of Android and iOS have a crafted-in QR code scanner. You don't really need to download any apps---just open up the digicam on your cellphone and level it at a QR code.
A QR (rapid reaction) code is https://zaynabudcz085719.snack-blog.com/29750925/the-smart-trick-of-qr-codes-that-nobody-is-discussing