A SKU (stock keeping unit) is a tool used in the field of inventory management as a specific product identifier. It is a number or term that is assigned to individual retail products to identify price, product options, and manufacturer. Different retail locations and sources of sale use different SKUs to identify products. Unlike UPC codes, these are not universal or standardized, but in house specific. SKUs keep track of inventory and each variant of a product has a unique SKU.
