In online shopping, a coupon is digital code or link that is used for a financial discount or rebate when making a purchase. Normally, coupons are issued by manufacturers or by retailers to be used in retail stores as a part of sales promotions. Traditionally, they are most often distributed through mail, but Internet coupons have become very popular lately.

Online merchants usually refer to coupons as "coupon codes," "promotional codes," "promotion codes," "discount codes," "key codes," "promo codes," "shopping codes," "voucher codes" or "source codes." Coupons usually provide shoppers free or reduced rate shipping, a financial discount, or some other special offer to encourage the purchase of a specific product.

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