A QR code (abbreviated from Quick Response code) is a type of matrix barcode or two-dimensional code which was first designed for the automotive industry. For example to see a test, scan the code on the right ...
More recently, the system has become popular outside of industry due to its fast readability and comparatively large storage capacity. The code consists of black modules arranged in a square pattern on a white background.
Although initially used for tracking parts in vehicle manufacturing, QR codes as of 2016 are used in a much broader context. Uses extend from commercial tracking to entertainment and from product marketing to in-store product labeling.
Many of these applications target toward mobile-phone users (via mobile tagging). Users may receive text, add a vCard contact to their device, open a Uniform Resource Identifier (URI), or compose an e-mail or text message after scanning QR codes. They can generate and print their own QR codes for others to scan and use by visiting one of several paid and free QR code generating sites or apps. Google has a popular API to generate QR codes, and Apps for scanning QR codes can be found on nearly all Smartphone devices.
QR codes storing addresses and Uniform Resource Locators (URLs) may appear in magazines, on signs, on buses, on business cards, or on almost any object about which users might need information. 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 telephone's browser. This act of linking from physical world objects is termed hardlinking or object hyperlinking.
QR codes can be used in Google's mobile Android operating system via both their own Google Goggles application or 3rd party barcode scanners like ZXing or Kaywa. The browser supports URI redirection, which allows QR codes to send metadata to existing applications on the device. Nokia's Symbian operating system features a barcode scanner which can read QR codes, while mbarcode[is a QR code reader for the Maemo operating system. In the Apple iOS, a QR code reader is not natively included, but more than fifty paid and free apps are available with both scanning capabilities and hard-linking to URI available. With BlackBerry devices, the App World application can natively scan QR codes and load any recognized Web URLs on the device's Web browser. Following an upcoming update, Windows Phone 7 will be able to scan QR codes through the Bing search app.
Just for a bit of information, in the US, QR Code usage is really expanding. Even back in June 2011, according to one study, 14 million mobile users scanned a QR Code or a barcode. 58% of those users scanned a QR or bar code from their home, while 39% scanned from retail stores. 53% of the 14 million users were men between the age of 18-34.
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