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The simple answer is that a barcode is a code that a contains information in the form of bars. This information is printed and then scanned (read) by a scanner that can decode the message in the bars and convert it back to the original information.

One of the most widely used ways of using barcodes is the UPC (Universal Product Code) that is the barcode we all see at the grocery store on every product we buy. The barcode contains a series of numbers that represent the manufacturer code as well as information about the product itself. When the scanner "reads" the barcode into the POS (point of sale) system, it matches the actual number with the item description and price.

The output of this simple action is the printing of your receipt with the item code, description and price you paid for it.

There are many types of barcodes, simple ones as the ones described above that contain only one type of information and more complex ones containing many pieces of information.

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