A QR code is a specialized type of bar code that allows you to encode information that can be read by a scanner app running on a mobile device. The QR stands for “quick response” because they allow the end user to quickly capture information you want to share. Much like a product bar code, the QR code is unique and the pattern is created depending upon the information it contains. To read the QR code you need to download a QR code reader to your smart phone or other mobile device. To read the code you simply activate your QR code app, and point it at the QR code square. Your device will read the code and transmit the information it contains.
Read more about Benefits of using QR codes here