What is a QR code?
They come to us from Japan where they are very common. QR is short for Quick Response (they can be read quickly by a cell phone). They are used to take a piece of information from a transitory media and put it in to your cell phone.
How does the cell phone read the code?
The cell phone needs a QR code reader, like this one from Kaywa
. It takes literally 1 minute for someone with an iPhone or Android phone to find and install the reader.