A stock-keeping unit or SKU is a number or code used to identify each unique product or item for sale in a store or other business. It is a unique identifier for each distinct product and service that can be purchased. The usage of SKU is rooted in data management, enabling the company to systematically track its inventory or product availability, such as in warehouses and retail outlets. They are often assigned and serialized at the merchant level. Each SKU is attached to an item, variant, product line, bundle, service, fee, or attachment. SKUs are often used to refer to different versions of the same product. For example, a retail store carrying the game Guitar Hero 3 might have six SKUs, two for each of the three platforms_one with and one without a guitar controller. SKUs are not always associated with actual physical items, but are more appropriately billable entities.
Contributions by Djjd47130, Stephan Leeds, and 184.108.40.206.