QR code which is short for quick response is used to take pieces of  information from a transitory media and put it in to your cell phone. QR codes can be found on many different types of advertising such as magazines, postcard, or even on web pages. QR codes are used to save information on a your cell phone, many QR codes have deals like promotions or coupons.

To generate a QR code you use websites such as Kaywa. These take seconds to generate on smart phone such as an iphone or an Android to find and install the reader. Google has a tool as well that will generate the QR codes.

 A QR can be tracked by the use of websites, google has a tracking modules (or UTM) parameters appended to the URL so that you can track the QR campaign in Google Analytics.

 Reasons people use QR code is to make information easy to access for consumers. QR codes are very helpful to companies when they are trying to send out important information to a large audience.

 http://searchengineland.com/what-is-a-qr-code-and-why-do-you-need-one-27588

http://www.lunametrics.com/blog/2011/08/18/tracking-qr-codes-google-anaytics/