Qr is short for Quick Response. It is used to take a piece of information from a transitory media and put it in to your cell phone. You may see QR Codes in a magazine advert, on a billboard, a web page or even on someone's t-shirt. The reason why they are more useful than a standart barcode is that they can store much more data, including url links, and text.
Image retrieved from http://www.v3b.com/2011/11/4-steps-to-a-successful-qr-code-campaign/
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