SKU (Stock Keeping Unit)

A stock keeping unit (SKU) is a unique alphanumeric identifier assigned to a distinct product variant in an inventory management system, representing a specific combination of attributes such as product type, size, color, material, and packaging that is tracked and managed as a discrete unit of inventory. Every unique purchasable variant of a product receives its own SKU: a t-shirt available in three colors and four sizes generates twelve distinct SKUs. SKUs are used throughout the supply chain for inventory tracking, purchasing, receiving, picking, packing, and sales reporting, and serve as the primary key linking product data across commerce systems.

In AI and data-driven commerce, the SKU is the atomic unit around which most operational and analytical work is organized. Demand forecasting models predict future inventory needs at the SKU level; recommendation algorithms surface specific SKUs; search and navigation systems must resolve customer queries to purchasable SKUs; and fulfillment systems must track physical inventory at the SKU-location level. The quality and consistency of SKU data—attributes, descriptions, images, pricing, and relationships—directly determines the quality of AI outputs downstream. Catalog management at scale, particularly when ingesting products from multiple suppliers or marketplace sellers, requires robust SKU matching and deduplication capabilities to prevent duplicate listings, merge variant data correctly, and maintain the accuracy of the inventory record that all downstream systems depend on.