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A barcode is an optical machine-readable representation of data which contains data about certain products. Barcodes are used for manufacturing and marketing.
Even though there a lot of symbologies available, the most common barcode representation consists of printed series of parallel bars with variable width.
Barcode makers will allow users to easily design barcodes, according to the symbology that best suits their necessities.
Furthermore, these applications typically allow users to also print out their barcodes, so as to be able to use them right away.