You probably already know how to scan a QR code with your phone. It’s simple enough: just open the camera app, point your phone at the code, and tap the link. What if you’re on your computer ...

QR codes are a close cousin of the bar codes on product packaging that cashiers scan with infrared scanners to let the checkout computer know what products are being purchased. Bar codes store ...

QR codes are a close cousin of the bar codes on product packaging that cashiers scan with infrared scanners to let the checkout computer know what products are being purchased. Bar codes store ...