A QR (Quick Response) code is a 2 dimensional code that can easily be read by cell phones or other scanning devices.  These codes are preferable to traditional bar codes as they can store more information in new and creative ways, and can be read by a greater amount of devices.

QR codes originated in Japan, but have become an essential part of marketing all over the world.  Qr codes can be found everywhere, from business cards, to magazines to product packaging.
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QR codes can store multiple forms of data such as url links, geo coordinates, and text.  This makes them a great tool for marketing as they can reveal to the reader several pieces of information as well as track reader statistics.