If you own a smartphone, you probably already know QRs, using your built-in phone camera to scan the code and then using a code reader to take you to a website where, supposedly, you'll get more information.
"QR" stands for "Quick Response" (sometimes also "Quick Read") and that's exactly what these multidimensional barcodes are for. They're supposed to save you the time and trouble of making a note of a website address by taking you straight there.
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