Warehouse glossary

SKU

A SKU (stock keeping unit) is the internal code a company assigns to each product and each variant it stores, such as each size, color or presentation.

Also known as
item code · product code

Reviewed October 29, 2026 by the Business in a Wave team

Its use in the warehouse

The company defines the SKU, and it is unique in its catalog; the barcode, in contrast, can come from the manufacturer (a GTIN) and be the same for every seller of that product. One SKU can have several barcodes, for example one for the unit and another for the case.

How Chainlink WMS applies it

In Chainlink WMS, each product has its code (P-1001, for example), its name, its barcode and its unit, and it is tracked by lot, by serial number or by neither. Products are entered one by one, imported from a file or received from the ERP through the API or a connector.

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