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Stackable coupons are offers that can be used in conjunction with other offers. For instance, if you have a Dell coupon code for a product discount, and you come across another Dell coupon code for free shipping, you might be able to use them together. This is called stacking.
In some cases, you can use as many coupons as you want, in others only one is accepted. Always check the fine print before you stack coupons.