This unique bar code is called a QR code (QR being short for Quick Response). These codes allow people to instantly learn more about an event, product, web site, business and more by linking you to content on any supported phone. Here's how it works:
Want to use it? Make sure your phone can scan a QR code with its camera, either with an application that you download or via software that's already installed on your phone. Your mobile cameraphone may be able to scan QR codes out of the box or you may need to download software.
When you see a QR code, use your phone's application to scan it. You will be taken instantly to information on your phone.