A QR code or Quick Response code is a type of barcode designed to be scanned with smartphones, with built-in cameras and other mobile devices. QR codes can have a lot more information embedded in them compared to the traditional UPC style barcode. QR codes direct the mobile user to websites and other online information; also any modern smartphone can scan and interpret QR codes.
A QR code is a black and white square containing black pixels with seemingly randomly placed black dots within the square and contain three small alignment squares in the corner of the QR code. These smaller squares in the corner of the QR code assist the QR reader and are the main focus for your scanning device. The pattern of the black pixels within the code contains the actual information for the QR code itself.
Consumer products and advertisement often contain QR codes in them. For example you see a billboard of a new car that you would like to know more about. You scan the QR code with your mobile device and the code will open your browser and show you specs and price of car and any other information you can think of. Many wine and coffee companies incorporate QR codes on their products, so when scanned shows the mobile user gets educated to where the grapes or coffee beans originated.
QR codes can contain virtually any type of data or information, and be seen everywhere from restaurant menus, t-shirts, to social networks and historic landmarks. To scan and interpret QR codes, you first need a QR reader app, which there are abundant of great sites with free downloads and reviews online. The Air Transport Association for airports has started to incorporate QR codes into boarding passes and also in hospitals for patient identification. You can also find QR codes on buildings, any kind of food packaging, subways and central bus stations, or even printed on bills.
Modern uses for QR codes:
Denso-Wave QR Code: