Thanks to the phenomenal growth of the iPhone and BlackBerry, and their growing menu of apps, more and more consumers are using their smartphones to interact with the Web. How will future marketers reach these consumers through their mobile devices? Enter the QR code.

A QR code ("Quick Response") a type of barcode that can be "read" by camera-equipped smartphones (the process is a bit like the checkout process in scanning UPC codes at your local supermarket).

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