Cross Sell Products are the items in store very close to the cash registers. In case you want your customer to do impulse buying then cross sell products are great in doing so. These will appear on cart page and that is one big difference from up-sell and related products.
The current eCommerce trend demands more than just selling the products of your store. Online store owners should modify the selling strategies adding advanced features, functionalities and many more attractions to their online store to retain existing customers and invite new customers.