Scan with your Bar Code app on your smart phone
Although initially used for tracking parts in vehicle manufacturing, QR codes are now used in a much broader context, including both commercial tracking applications and convenience-oriented applications aimed at mobile phone users (termed mobile tagging). QR codes can be used to display text to the user, to add a vCard contact to the user’s device, to open a Uniform Resource Identifier (URI) or to compose an email or text message. Users can also generate and print their own QR codes for others to scan and use by visiting one of several free QR code generating sites.
QR codes storing addresses and Uniform Resource Locators (URLs) may appear in magazines, on signs, buses, business cards, or almost any object about which users might need information. Users with a camera phone equipped with the correct reader application can scan the image of the QR code to display text, contact information, connect to a wireless network, or open a web page in the phone’s browser. This act of linking from physical world objects is termed hardlinking or object hyperlinking.
Source: wikipedia