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In a Nutshell: What Are QR Codes?

What is a QR Code? At its most basic, a QR Code is a barcode on steroids. They're used for encoding information in two-dimensional space -- like in the pages of magazines, in advertisements and even on TV and Web sites. They were originally used to track auto parts, but have become popular (especially in Japan) for much broader, often commercial purposes. How is it different than a...