A Stock Keeping Unit (SKU) is a crucial element of marketing for businesses who sell products or services. It is a unique code that is assigned to each individual item in inventory, and it is used to track the quantity, cost, and sale price of an item. SKUs enable businesses to accurately monitor their stock levels, allowing them to make decisions about whether or not to restock certain items. SKUs are also useful for allocating resources, creating promotional activities, and helping to identify potential problems with supply chain management. With SKUs, businesses have a powerful tool to maximize their profits and meet customer needs more efficiently.