The QR code, similar to a barcode, is an example of an information matrix. However a significant difference in the two is that while a barcode only holds information nicely in the horizontal direction, a QR can do so vertically as well. This is why QR codes are referred to as two-dimensional, because they carry information both vertically and horizontally. Another direct result to this is greater potential to carry information in a smaller space. Compared to a barcode, it’s no competition at all.
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