A cross-sell is an offer or nudge that aims to compel customers to purchase a complementary item to the one they are already buying. This is usually a product that is an easy yes question for your customers to answer.
Cross-sells are purchased alongside the original product.
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Try it out
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Go ahead and click 'Add to Cart'. You will then see the cross-sell offer. By accepting the offer this will add the original product that was in the cart. This will be reflected on the check out page.