A barcode is a small image of lines (bars) and spaces that is attached to retail store items, identification cards, and mail to identify a specific product number, person, or location. That code uses a sequence of vertical bars and spaces to represent numbers and other characters.
In the world wide web, you can see a large amount of information about the so-called matrix codes, they are also 2D barcodes. What are they and what are they used for?
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