Up-sell products are additional products that are suggested to customers during the checkout process or while they are browsing the online store. These products are usually related to the product the customer is already interested in or have similar features, and are presented as an alternative or an upgrade to the original product. The goal of up-selling is to encourage customers to purchase more or higher-priced items, thus increasing the overall value of the sale. Some examples of up-sell products could include accessories or complementary products, higher-end versions of the original product, or bundle deals that include multiple products at a discounted price.