QR codes, originally developed as two-dimensional matrix barcodes for rapid data acquisition, have undergone significant transformation and expansion in application. Their evolution from simple ...

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.

What is a QR Code? A quick-response code (QR code) is a type of barcode that contains data for a locator, an identifier, and web tracking. QR codes have been around for a long time. They were first ...