Is the width of the bar code number, ranging from black bars and gaps, arranged according to some encoding rules for expressing a set of information graphics identifier. Common bar codes are very different from the reflectivity of the black bar (the bar) and white bars (the empty) arranged in parallel lines pattern. Items can be marked barcode producer, manufacturer, product name, date of production, book classification number, e-mail start-stop location, type, date, and many other information, which in commodity circulation, library management, postal management, banking system, and many other areas has been widely used. 

 High-performance bar code identification of the company, price, service quality, as used by many customers.