QR code, short for Quick Response Code, is a kind of matrix barcode that includes information about a product or service. You can find it being used for advertising purposes, where brands put up ...

Among the many changes brought about by the pandemic is the widespread use of QR codes, graphical representations of digital data that can be printed and later scanned by a smartphone or other device.

QR codes have become a convenience of modern life. Just scan the black and white mosaic with your phone’s camera and you can do everything from connect to your hotel room Wi-Fi to pay for that public ...