A barcode is a machine-readable picture representing the data about the product. It consists of numbers of parallel black and white stripes (“bars”). Series of numbers may be used to search for data on a particular product with the help of such tools as Barcode Lookup
A UPC (short for Universal Product Code) is a code used to mark retail product packaging for further identification of each particular item.
A EAN (short for European Article Number) is used to identify a product and its manufacturer. EAN is a superset of UPC (American standard).
ISBN (International Standard Book Number) is used as an identifier for commercial books. ISBNs are provided by affiliates of the International ISBN Agency. Each edition and variation of a book has its own unique ISBN.
GS1 is an organization that provides global standards for business communication. UPC (GTIN-12) is a unique number used to identify items and products in sales outlet. GTIN-14 is used for logistics purposes
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