Who are QR Codes?

QR Codes are the trademark for a type of matrix barcode first designed for the automotive industry in Japan.
The QR code has became popular outside automotive industry due to its fast readability and greater storage capacity compared to standard UPC barcodes.

Storage: the amount of data that can be stored in the QR code symbol depends on the datatype and on the error conection level. The maximum storage capacities occur for 40-L symbols.
Here are some examples of QR code:

                                   
                                   


Uses: originally designed for industrial uses, QR codes have become common in consumer advertising. Typically, a smartphone is used as a QR-code scanner, displaying the code and converting it to some useful form.