A QR Code is a bar code that can be scanned using your camera phone and a QR Code Reader. You can easily create QR codes that serve as hyperlinks to mobile content.
In many parts of the world the scanning of a QR Code has become the door to the mobile Internet for the average mobile user.
If you have a phone/reader with this option try the links on this site.

   

More info:

Wikipedia

Make your own code

Technical info

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