"Buy one get one free" is a popular sales promotion where customers can purchase one item and receive another identical item at no additional cost. This offer encourages shoppers to buy more, as they perceive they are getting a better deal. It is commonly used in retail stores, supermarkets, and online shops to boost sales and attract customers. This type of promotion can apply to various products, including groceries, clothing, and electronics. It is often advertised with signs or online banners to catch the attention of potential buyers. Customers should check the terms of the offer, as some restrictions may apply.