Cách sử dụng
A coupon is a piece of paper or a code that you can use to get a discount or a special offer when you buy something. You can usually find coupons in newspapers, magazines, or online. When you go to a store or shop online, you can use the coupon to save money on your purchase. For example, if you have a coupon for 10% off, it means you can get 10% off the price of the product you want to buy. Coupons are a great way to save money and get a good deal!