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A 'QR Code' short form of 'Quick Response Code' is a type of matrix barcode or two-dimensional barcode. A barcode is a machine-readable optical label which contains information about the item to which it is attached. It can be read easily by a digital device and it stores information as a series of pixels in a square-shaped grid.
QR codes often contain data for a locator, identifier or tracker which points to a website or application. A QR code is read in two directions from top to bottom and right to left. This allows QR codes to house significantly more data. The data stored in a QR code can include website URLs, e-mail addresses, locations, phone numbers, or up to 4,000 characters of text.
The first QR code system was invented in 1994 by the Japanese automotive company Denso Wave, a Toyota subsidiary.