A coupon is a small piece of paper or digital code that entitles the holder to a discount or special offer on a product or service. It is typically given out by a retailer or manufacturer as a way to attract customers and promote sales. Coupons can be found in newspapers, magazines, and online, and often have an expiration date. They can provide a percentage off the total purchase price, a specific dollar amount off, or a free item with a purchase. Savvy shoppers use coupons to save money and stretch their budget, making it a popular and effective marketing tool for businesses.