You might have seen them without knowing what they are: little black and white boxes with squiggles and lines in the corner of a magazine advertisement, on a band's poster in a coffeeshop, or even on a T-shirt. Those things, called "QR codes," or "quick response codes," are part of a whole new way of connecting with consumers via their smartphones. "QR Codes have been around for quite some time in other parts of the world, but they are catching on in the States for a few reasons," said Patrick Donnelly, a mobile solutions architect for 2ergo.com.
e-Commerce Times