QR code ( Quick Response Code) is the trademark for a type of matrix bar code (or two-dimensional bar code) which is initially designed in Japan fro the automotive industry, now it is widely used outside this industry.
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QR codes have become common in consumer advertising. Smartphone users can install an app. with a QR-code scanner that can read a displayed code and convert it to a URL directing the smartphone’s browser to the website of a company, store, or product associated with that code providing specific information.