QR Code is a specific matrix barcode (or two-dimensional code), readable by dedicated QR barcode readers and camera phones. The code consists of black modules arranged in a square pattern on a white background. The information encoded can be text, URL or other data.
It was created by Toyota subsidiary Denso-Wave in 1994, the QR code is one of the most popular types of two-dimensional barcodes. QR is the abbreviation for Quick Response.
There are a number of sites for generating QR codes and they’re all free. One that is Kaywa, a site created by Datamatrix, which is another pioneer of 2D codes. You can use it to create QR codes that link to a web page, text, phone numbers, or SMS.