QR Code (Quick Response Code) is a two-dimensional code in the form of an image which is used to store information (like a link) in it.
QR code can be decoded using QR code readers.
The code consists of black square dots arranged in a square pattern on a white background [source: Wikipedia].
QR codes can be used to redirect and track a link, it is an image that represents your tracking link. To get the QR code image from the tracking link, just add the suffix “.qr” (with a dot) at the end of your ClickMeter tracking link.