What is a QR Code?

A QR Code (it stands for "Quick Response") is a special kind of barcode that can be read by a mobile phone or camera-enabled device that has QR Code decoding software installed on it.

It can simply be a print based hypertext link that contains your URL (web address) and when a camera-enabled mobile is pointed at it, the browser will start up and go straight to that URL.

But it doesn't stop there - a QR Code can also contain a phone number, an SMS message, V-Card data or just plain alphanumeric text, and the scanning device will respond by opening up the correct application to handle the encoded data appropriately, thanks to the FNC1 Application Identifiers that are embedded in the encoded data.

The technical specifications for a QR Code are set down in the ISO-18004 standard so they are the same all over the world, and the only significant variations from one QR code to another (apart from the data it contains) is the number of modules required to store the data.