Barista receives a customer lining up to pay in a cafe's counter where a QR code information graphic is displayed. In a hotel lobby, two QR Codes promote the same thing: a 10% discount on the ...

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 ...