Discount codes are special alphanumeric codes that customers can enter during the checkout process to receive a reduction in the price of their purchase. These codes are often provided by retailers as a marketing strategy to encourage sales, attract new customers, or reward loyal shoppers. They can offer a percentage off the total price, a fixed amount off, or free shipping. To use a discount code, customers typically enter it in a designated field on the retailer's website before completing their order. Many online stores, including popular platforms like Amazon and eBay, frequently offer these codes through newsletters, social media, or promotional events.