QR CODE (quick reponse code)

This code is a useful way to save information. At first, it seems like a strange pic or image, but their black and white colours, and their shapes are colocated in a srategic form. By taking a photo of it you can guess the information that it hide.
Information from: http://es.wikipedia.org/wiki/C%C3%B3digo_QR
 I will applicate this type of technology in big stores, supermarkets and mainly in works that require to move quickly.