Scanning a QR code without your phone requires a little help from Google or a webcam.

Scanning a QR code without your phone requires a little help from Google or a webcam.

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 information along one axis, horizontally. QR codes store information in both vertical and horizontal axes, which allows them to hold significantly more data. That extra amount of ...

QR codes became the solution to both these problems. By introducing QR codes that redirected the customer to an online menu, restaurants no longer needed printed menus.

A computer scientist explains why you should not trust all QR codes Just as it can be hazardous to click links in emails, visiting URLs stored in such codes can also be risky.