In New South Wales, Australia, where Mr. Wilson lives, QR codes for tracking pandemic behavior are posted at restaurants and retail stores. However, if you print the 'File that describes the QR code ...

I have a friend who calls me occasionally to come help him with various little things having to do with the technology at his house. This week, one of his requests was to learn more about QR codes and ...

Add Yahoo as a preferred source to see more of our stories on Google. You can scan the QR code on your own smartphone without needing a second device. Photo: Getty Images QR codes can be scanned ...