What is a QR code?
How is a QR code used?
For devices, such as smart phones, that have a QR reader installed the reader can be used to scan the code and connect the device to a website (or have it dial a phone number, start an email to a specified email address, etc.) that the QR that is embedded in the QR code.
Why use a QR code?
Rather than rely on someone to remember or type in information, your target audience can just scan the code and have their device do the work. If someone is interested, once their smart device had the information they can refer to it at a later date or deal with it on the spot.