What is Cross-Sell?
Cross-sells are products that you promote in the cart, based on the current product.
They are typically complementary items. For example, if you are selling a laptop, cross-sells might be a protective case or stickers or a special adapter. Or if you’re selling a ninja t-shirt, they could be a ninja hoodie and ninja socks.
Depending on your theme template, they display on the cart page underneath the cart products table with a thumbnail image.