QR code apps for iPhone

A QR code is a matrix code or two-dimensional bar code created by Japanese coporation Denso-Wave in 1994. The "QR" is derived from "Quick response" as the creator intended the code to allow its content to be discode at high speed.

QR is common in Japan, where they are currently the most popular type of two dimensional codes. Most current Japan mobile phones can read this code with their camera.

By doing this QR code, iPhone camera can facilitate this function in order to find out the information.

Source: http://iphone.click2creation.com/2009/12/qr-code-apps-for-the-iphone/