Lately, I've been seeing a lot of "mobile tags" crop up in advertisements. Mobile tags are small, square two-dimensional barcodes that you can scan with the camera on your smartphone, and they work very much like links on a web page—except that they're in printed ads. You point your phone at the barcode, and the phone opens up a browser window to the site. Brilliant! After I learned about the mobile tag, the next question in my mind was, "What type of barcode is that?" ...

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