QR (Quick Response) Codes are two-dimensional bar codes. They store much more information than a bar code. The code can be scanned and read by a bar coder or camera phone. The application loaded on to the phone can decode the information and present the data in a readable format. The code can contain text, video, images and direct the user to web sites.
The codes were originally developed in Japan and used to track parts in the manufacturing of vehicles. Use has transferred now to other commercial areas as well as education.
Here’s an article from the Journal of Educational Technology Development and Exchange on QR Codes in Education and below is a short video on the use of QR Codes in schools.