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GTIN, UPC, EAN and MPN: useful clues, different roles
What product identifiers can tell you, and what they cannot.
A product title is written for a reader. An identifier is intended to give systems a more stable reference. A GTIN is a Global Trade Item Number. UPC and EAN are familiar barcode forms used to carry these numbers. A barcode and the item information associated with it are related, but they are not the same thing.
An MPN is a manufacturer part number. Its meaning depends on the manufacturer and the way that manufacturer assigns references. A retailer’s SKU serves another purpose: it identifies an item in that retailer’s own catalogue. The same SKU text in two different stores should not automatically be treated as a shared global identity.
These references are useful because they can outlast changes in wording. But their presence does not remove the need to inspect the listing. A number may be copied to the wrong variant, or a reference may describe a broader product rather than the selected configuration. A valid check digit can help detect some transcription mistakes; it cannot prove that the number was attached to the right item.
For a shopper, the practical habit is to compare the identifier together with the manufacturer, model and chosen variant. If the number agrees but the size or configuration conflicts, investigate the conflict. Identifiers should make a comparison more accountable, not make contradictory details disappear.
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