Retail stores of all types, fashion retail, shoes, jewelry, pharmacy, sporting goods, gift shop, or eCommerce giants like Amazon, use SKUs for inventory management. SKUs help identify stock on hand, in-transit, and sales performance of items. Retail stores using point of sale systems and eCommerce platforms can also recommend related products to customers using SKUs. Say, a customer wants to buy a medium-sized T-shirt with a round neck. When the item is punched onto a POS, the POS system can recommend that the same T-shirt is also available in white and blue colors. The same is true for eCommerce platforms.