Discount Codes enable merchants to run special deals their shoppers can take advantage of during certain seasons, events, or sign-up promotions.
Merchants can limit the number of discounts that can be applied to a given cart. This ensures discounts can't be stacked to take advantage of items already on sale and helps prevent scenarios where the total balance owed on a cart is negative.
Merchants can allow the application of multiple discounts to entice both returning and new shoppers to proceed with a checkout. Only cart platforms that innately support multiple discounts can leverage this functionality.
A new shopper has signed up to your newsletter and received a $5 coupon via email. They would also like to take advantage of the current promotion displayed across your store where all orders over $100 can apply a coupon for free shipping. Enabling multiple discounts would encourage this shopper to proceed with checkout, knowing they don't have to choose only one discount.