QR tag (Quick Reponse code)

A QRtag or Quick Response code is a twodimensional barcode. These are often used for adding web links to a printed page. When scaned using a web cam or mobile phone camera, the QR reader application can take you to a Web site, a YouTube video or some other web content. QR codes are an easy way of sending people to a site without having to type a URL
Also QR tags can be used for containing other information such as;
A QR code on a business card can contain an electronic version of the contact information. Scan the code and the reader application adds the contact to your address list.
A QR code can contain event information. Scan the code on a poster for a concert and the app automatically adds its name, date and location to the agenda on your smartphone or PC.
A QR code can contain an SMS with phone number and text. Scan the code and the scanning app lets you automatically participate in some contest to win fabulous prices.
A QR code can contain an e-mail message with a subject and message text. That message can be a request for information so that in return you might get a reply email with additional information and attached files.
A QR code can contain a geographical location. Scan the code on a poster advertising for a restaurant and its location becomes available to your navigation software, informing you how to get to that place.
WIFI configuration data.
These are many of the Uses a QR tag can have, I have been researching into QR tags to try adding one myself to my website. At the moment it is early days and Im still decied what to use it for and how to make it. I have found a website that you can create a QR tag for free online but personally I would like to have a look at the coding and see how it works and possibly try it myself.
Here is a useful link : http://www.qrtag.net/create