A QR Code (it stands for "Quick Response") is a mobile phone readable barcode that's been big in Japan forever, broke into Europe a while back, and is now getting traction in USA.
In its simplest sense think "print based hypertext link" - simply encode a URL into the QR Code and then point a mobile phone (or other camera-enabled mobile) at it. If the device has had QR Code decoding software installed on it, it will fire up its browser and go straight to that URL.
How can I create a QR code?
You will need to go to a QR code generator website. It’s easy but you will need a URL address to create your code. These are just a few you may visit to create your QR code.
OK . I’ve created my QR code now what do I need to read it on my phone?
You will need a QR scanner app downloaded on your phone. These are 2 websites where you can find many free QR code scanners. Once in the apps store, just type in QR Code scanner.
These are two barcode readers available in the iTunes app store. They are both free. There are many free barcode scanner apps. Be sure and click on the app icon to get more information and read the reviews before downloading to your phone. Then go out and have some fun!