If you haven't heard of Quick Response Barcodes or QR Codes, give it time. A QR code is basically a two-dimensional matrix barcode that can be read by barcode readers and camera phones. The code, which is made up of black modules on a light background, can
be encoded with text, URL, or other data.
The QR Codes were initially used to track parts in vehicle manufacturing. Now they are popping up on facebook and people are even getting QR Code Tattoos.