QR codes are a sort of two-dimensional
barcodes. It's quite much a de-facto standard for mobiles in Japan and is gaining in popularity world-wide. Some people incorrectly assume that "QR codes" and "2D barcodes" are synonyms, however there're dozens of 2D barcode formats/standards and QR code is just one of them (check out the
Wikipedia page for an extensive list of 2D barcode formats). QR codes can hold all sorts of content, not just numbers, text or URLs (which is the most common use of QR codes). They can hold up to 2953 bytes so small icons, images are also embeddable.
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