{"section":"tutorials","requestedLocale":"en","requestedSlug":"what-is-an-sku","locale":"en","slug":"what-is-an-sku","path":"docs/en/tutorials/catalog/products-and-skus/what-is-an-sku.md","branch":"main","content":"First, let's make clear what the acronym SKU means. From the English *Stock Keeping Unit*, it is the physical unit of the product. This means that __the SKU is the variation of the product__. It contains the characteristics that make it a specific type of product.\n\nIf your store has a Shirt product, its SKUs might be __Blue Shirt__, __Red Shirt__, and __White Shirt__. Another way to classify your SKUs could be: Blue Shirt S, Red Shirt L and White Shirt XL.\n\nIn the Catalog hierarchy, the SKU is just below the product.\n\nStructurally, first you define the product information and then you create your SKUs."}