A QR code is a matrix barcode (like a price barcode found on common store merchandise) that can hold up to 7,000 digits of information (a regular barcode can only hold about 20). The QR stands for Quick Response because the codes were designed (by Toyota subsidiary Denso-Wave) to be decoded at high speed. This can be extremely helpful to a business that wants to place an ad in a newspaper but has limited room or as a source of information/logo on a business card.

How do QR Codes work?  read more »