The QR stands for Quick Response and basically these codes were created by the automotive industry (Toyota) as a better means of tracking than standard barcodes as they are quicker to scan and decode.
Since the advent of apps on smart phones such as the iphone and android phones and game consoles such as the Nintendo 3DS QR codes have found multiple new uses. Essentially you can store any sort of data within a QR code but the most common use now is to store internet URLS.
For example this blog post’s URL is http://www.waterfordwebdesign.ie/what-are-qr-codes/
If you were reading this article on a newspaper or were reading information about the website on a flyer it would be slightly inconvenient to open your browser and type in the URL and it would be prone to human error.
QR Codes to the rescue
As well as posting the link I could also print the QR code with the article or flyer. To get a QR Code all you have to do is go to one of the many free QR generator sites e.g. http://www.qrstuff.com/
For the link above this produced:
If you now go to your phones app store and download a QR scanner and scan the above QR Code you will be brought to this article on your iphone.
This one will bring you to UTD Web Design