QR code cards and Bar code cards are common in our lives. They can be seen in supermarkets, clothing stores or food stores.Although QR code cards and bar code cards are very cheap, they are very high technology.

Bar codes can speed up productivity and track product sources,

For example, the Tobacco Bureau uses bar codes to track the origin and basic information of cigarettes.Bar code output is very efficient, more than five times the keyboard.And the bar code can store a lot of information.Previously bar codes had to rely on a scanner scanning. And now all smart phones can scan.

The QR code is more powerful than the bar code, and can store up to four or five hundred Chinese characters, and can also store pictures.

They also have shortcomings, such as poor confidentiality, vulnerability, and work within the visible range. But these are irrelevant.The cost of bar code cards and QR code cards is extremely low, Make people’s lives more automated.

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