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.
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