Hi,
The above is the QR Code of "http://php-drops.blogspot.com/". It can contain website URLs, text or other data. It is similar to bar code, but more portable in various devices. The beauty of this is, all you need to decrypt the code is a smart phone with a camera. You need to have a reader in it. Take a picture of the above and you will get the details of the code in your mobile on the go. Here is a video I found in Youtube which demo's how to use it:
Quick Response code are getting really popular. It was introduced by Toyota. Its more commonly used in Japan. For those who are wondering what a QR Code is, this is how it looks like:
