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 ...

QR codes are convenient because they can be scanned with a smartphone camera to access a website URL or used as secure login information, but because they are generally simple, black and white ...

Ever since Meta introduced a QR code-based feature to share Instagram profiles, users no longer had to spell out their account name to a new friend or type it out. The simple ‘Share Profile’ button ...