what is bar code??
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A barcode, consisting of bars and spaces, is a machine-readable representation of numerals and characters. ... A barcode consists of bars and spaces of varying width that can be read with an optical barcode scanner.
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A bar code (often seen as a single word, barcode) is the small image of lines (bars) and spaces that is affixed to retail store items, identification cards, and postal mail to identify a particular product number, person, or location. ... A barcode reader is used to read the code.
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