A QR Code - "Quick Response" - is a mobile phone readable barcode that can link the mobile phone to pieces of content such as a phone numbers, URLs or email addresses.
If you have a mobile phone that can read a QR code, simply point it at the code and the content should appear in your phone.
Your phone may already have QR code reader software pre-installed, but if not you'll need to install it. Check in your phone’s App Store.
Please note: Accessing a QR code will most likely link you to the mobile internet and network data charges may apply. Check with your operator.
For more information about QR Codes visit the Wikipedia entry.