Designed as a high-tech marketing resource, QR (quick response) codes have many useful applications. These (usually) black-and-white algorithmic codes are gateways to a potential multimedia nirvana.

You may have noticed the proliferation of QR codes in your mailbox in the last few years. We certainly are moving toward a digital world, and QR codes are part of that evolution. A QR code is a ...

My QR code reader was in a loop of error messages and had no intention of snapping out of it. “Hold over QR code…” The real-estate section of our Sunday paper ...