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A QR Code is a matrix barcode (or two-dimensional code), readable by QR scanners and smartphones that have a barcode reader app. The code consists of black modules arranged in a square pattern on white background. The information encoded can be text, URL or other data.
Although initially created by Toyota for tracking parts in vehicle manufacturing, QR Codes are now used in a much broader context, including both commercial tracking applications and convenience-oriented applications aimed at mobile phone users (known as mobile tagging). ‘QR ‘ ostensibly stands for ‘quick response,’ describing how quickly the data in the code can be decoded.
QR codes storing addresses and URLs may appear in magazines, on signs, buses, business cards, etc. Users with a camera phone equipped with the correct reader application can scan the image of the QR code to display text, contact information, connect to a wireless network, or open a web page in the phone's browser.
Marketers have used QR codes to link users to product instructions, contest entry forms, videos, etc. A QR code used to link from physical world objects to online addresses and information is known as a hardlink or physical world hyperlink.
Users can also generate and print their own QR Code for others to scan and use by visiting one of several free QR Code generating sites.