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Upselling is a sales technique that encourages the customer to buy more expensive items, upgrades, or other add-ons of a product than what they originally intended to purchase, while cross-selling is a sales technique that involves offering an additional product or customer to an existing customer.

Cross-selling is a sales technique that involves offering an additional product or customer to an existing customer. It involves selling complementary or related products to a customer to increase the value of a sale.

There are over 26 million eCommerce sites across the entire globe, with more and more being created every single day.

Here's a list of 20+ largest eCommerce companies in the world with annual revenues exceeding $1 billion.

Since the invention of the internet, there has been an increase in the number of internet companies. Today, internet companies have grown to be among the biggest ones in the world in terms of revenue,...