What is a QR code? A QR Code is a matrix barcode (or two-dimensional code), readable by QR scanners, mobile phones with a camera, and smartphones. The code consists of black modules arranged in a square pattern on white background. The information encoded can be text, URL or other data.

via QR Code – Wikipedia, the free encyclopedia.

You can use them in a lot of cool ways to transmit whatever text based info you want to;

Print it on a T-shirt so any one can scan you for your digits! Print it on the back of your business card to make it easy for people to enter your contact info with out typing. Print it on magnetic sign for your company car door where anyone can scan it and know what you do! Put it on a billboard or in any print advertising you do. Put in your email . . . → Read More: QR Codes are Cool and Hot