Promotions are discounts that don’t require the buyer to enter a coupon code. They can apply store-wide or be set on specific combinations of categories, brands and tags to only apply to some parts of your catalogue.
Coupons can be set up to be single-use, multi-use or single-use per customer.
Coupons can either be a $ discount or % discount and have a minimum purchase amount to qualify.
You can also set a start and end date on coupons and promotions.