Promo codes are special codes that customers can use to receive discounts or special offers when shopping online or in stores. These codes are often a combination of letters and numbers and can be entered at checkout to reduce the total price of a purchase. Retailers use promo codes as a marketing strategy to attract new customers or encourage repeat business. Promo codes can be found on various platforms, including retailer websites, social media, and email newsletters. They may offer a percentage off the total purchase, a fixed amount off, or free shipping. Customers should check the terms and conditions associated with each promo code to ensure it applies to their order.