QR-code is nothing but 2d bar code where you can present urls,text,sms,phone numbers in graphics format. You can use mobile phone app to scan qr code and use it. You can use any QR-code scanner.
For example: you saw any product with qr code where product company stored url with more description about that prduct. Just use your smart phone and scan qr code and browse that url to know more details. There are many uses with QR codes.
http://timewasteblog.com, when converted to QR code – It looks below.
timewasteblog.com when converted to qr-code
YOu can see following creative video about usuage of QR video [ video stolen from http://qrcode.kaywa.com/ famous online qr code generator portal.]
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