What is a bar code? Bar code: Bar code technology is an automatic identification technology which is produced and developed in computer application and practice. It is widely used in commerce, postal service, book management, warehousing, industrial production process control, transportation and other fields. It has the advantages of fast input speed, high precision, low cost and strong reliability, and plays an important role in today's automatic identification technology. The concept of bar code A bar code is a mark composed of a set of regularly arranged bars, spaces and corresponding characters. "Strip" refers to the part with low light reflectivity, and "empty" refers to the part with high light reflectivity. The data composed of these bars and spaces express certain information, which can be read by special equipment and converted into binary and decimal information compatible with computers. Usually, the code is unique for each item. For ordinary one-dimensional bar code, it is necessary to establish the corresponding relationship between bar code and commodity information through the database. When the barcode data is transmitted to the computer, the application programs on the computer will operate and process the data. Therefore, the ordinary one-dimensional bar code is only used as identification information, and its significance is realized by extracting the corresponding information from the database of the computer system. Advantages of barcode technology Barcode is by far the most economical and practical automatic identification technology. Bar code technology has the following advantages: a. Fast input speed: compared with keyboard input, bar code input speed is five times that of keyboard input, which can realize "instant data input". B High reliability: the error rate of keyboard input data is 300%, the error rate of optical character recognition technology is110000, and the error rate of barcode technology is less than110000. C. The amount of information collected is large: the traditional one-dimensional bar code can collect dozens of characters at a time, and the two-dimensional bar code can carry thousands of characters, and it has certain automatic error correction ability. D. Flexible and practical: Bar code identification can be used as a means of identification alone, can also be combined with related identification equipment to realize automatic identification, and can also be connected with other control equipment to realize automatic management. In addition, the bar code label is simple to make, has no special requirements for equipment and materials, and the identification equipment is simple to operate without special training, and the equipment is relatively cheap.