ASIN
Amazon Standard Identification Number - A unique 10-character alphanumeric code that Amazon assigns to every product in its catalog. ASINs are essential for product identification, listing creation, and inventory management. For books, the ASIN is the same as the ISBN-10.
Related Terms
UPC
Universal Product Code - A 12-digit barcode standard used in North America for product identification. Sellers need UPCs (from GS1) to create new product listings on Amazon, though exemptions exist for some private label products.
SKU
Stock Keeping Unit - A unique identifier that sellers create for their own inventory management. Unlike ASINs (which are Amazon-assigned), SKUs are created by the seller and can include information about the product variant, supplier, or purchase date.
EAN
European Article Number - A 13-digit barcode standard used internationally for product identification. Similar to UPC but used primarily outside North America. Amazon accepts both UPCs and EANs for product listing creation.
FNSKU
Fulfillment Network Stock Keeping Unit - A unique barcode that Amazon assigns to FBA inventory to track products in their fulfillment centers. FNSKUs are specific to each seller's account, preventing commingling of inventory from different sellers.