A discount code, also known as a promo code or coupon code, is a unique combination of letters and/or numbers that can be entered at the checkout of an online store to receive a discount on a purchase. These codes are often provided by retailers as a way to incentivize customers to make a purchase, and can offer a percentage off the total price, free shipping, or other special deals. Discount codes are a popular way for shoppers to save money and for businesses to attract and retain customers. They are typically time-sensitive and can only be used once per customer, making them a valuable and sought-after commodity in the world of online shopping.