Term:QR Code [Quick Response]

A QR or Quick Response code is an image containing digitally encoded information that can be “read” by compatible devices. It operates much like a UPC barcode on groceries; however, unlike a UPC, which can contain only numbers, a QR code can contain text.

Most commonly, QR Codes are scanned by apps on smartphones, using the built-in camera. As a result, most QR codes are simply encoded links to pages on the web.

The example QR Code below encodes the URL http://go.ask-leo.com/qraskleo, a tracking link that will take you to http://askleo.com.

Ask Leo! QR Code

QR Code (Wikipedia)

QR code for the URL of the English Wikipedia Mobile main page

A QR code (abbreviated from Quick Response code) is a type of matrix barcode (or two-dimensional barcode) invented in 1994 by the Japanese automotive company Denso Wave. A barcode is a machine-readable optical label that contains information about the item to which it is attached. In practice, QR codes often contain data for a locator, identifier, or tracker that points to a website or application. A QR code uses four standardized encoding modes (numeric, alphanumeric, byte/binary, and kanji) to store data efficiently; extensions may also be used.

The Quick Response system became popular outside the automotive industry due to its fast readability and greater storage capacity compared to standard UPC barcodes. Applications include product tracking, item identification, time tracking, document management, and general marketing.

A QR code consists of black squares arranged in a square grid on a white background, which can be read by an imaging device such as a camera, and processed using Reed–Solomon error correction until the image can be appropriately interpreted. The required data is then extracted from patterns that are present in both horizontal and vertical components of the image.

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