It is generally called bar code in the international included China. It is graphics identifier which ranges many black bar and blank of different width according to certain encoding rules to express a group of information. The bar code we usually see is the graph of parallel lines ranged by black bar (It is referred to as bar.) and white bar (It is referred to as blank.) of much different reflect. Barcode can label a lot of information, for example the exporting country, making factory, commodity name, manufacturing date, book classifying number, the starting and ending points of mail，catalog, date and so on. So it has been widely used in many areas, for example, commodity circulating, book managing, post managing, bank system and so on.
The common commodity barcode is made up of prefix, manufacturer code and checksum. The prefix code of commodity barcode is used to label the code of country and region. The power belongs to International Article Numbering Association, for example,00-09 represents USA,Canada,45-49 represents japan,690-695 represents china,471 represents Taiwan of china,489 represents Hong Kong special region. The code authorization of the manufacturer belongs to the foods coding organizations in different countries and regions. In china it belongs to national foods coding centre to authorize code to manufacturer. The commodity code is the code used to label commodity. The execution of coding power belongs to the manufacture enterprise itself. Enterprises themselves decide which Arabic numerals will be used as the commodity barcode on which commodity of their own according to regulation rules. In the last the commodity use one verifying code to check out the first to twelfth character code on the left in the commodity barcode. The commodity barcode is referred to the mark composed by a group of regularly ranged bar, blank and corresponding character and the sign used to transmit some commodity information. Among them bar is dark color and blank is light color. They are used to be scanned by barcode reading device. The corresponding character are composed by a group of Arabic numerals so as to people can read directly or put data into computer through keyboard to scan. The transmitted information by the bars and blanks is same to their corresponding character.
The barcode technology is born with the development and application of the computer and information technology. It is a new technology which gathers coding, printing, identifying, data collecting and dealing in one.
Using barcode is an irresistible trend in circulation in the future market. Enterprise must observe some rules referred to commodity barcode management in order that commodity can be circulated in all over the world freely and widely, no matter its design manufacture, register application or using commodity barcode