"Buy-one-get-one-free" (often abbreviated as BOGO) is a popular sales promotion where customers can purchase one item and receive another identical item at no additional cost. This type of offer is commonly used by retailers to encourage customers to buy more products, as it provides an incentive to make a purchase. Typically, BOGO deals apply to specific items or categories, such as groceries, clothing, or household goods. Customers can take advantage of these promotions to save money while stocking up on their favorite products. However, it's important to read the terms and conditions, as some offers may have restrictions or expiration dates.