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An SKU is a unique identifier associated with your products. Each product you offer, when using an inventory management program, will correspond to a SKU. That SKU is then tracked in your inventory management software when sales occur or deliveries are made; increasing and decreasing as product supplies change. What this provides you, as an online business owner, is the ability to have inventory control management-- knowing when to buy more of an item or create a big, blow-out sale to get rid of overstock.