Upselling aims to increase the value of a sale by persuading the customer to buy a more expensive version of the chosen item or other add-ons. Online retailers rely heavily on upselling because:

Upselling techniques can be applied before a purchase (as recommendations at the bottom of the page and/or sidebar), during the purchase (as pop-ups in the shopping cart, on the checkout page, or in the abandoned cart emails), and after purchase (through personalized follow-up emails).

Best practices include: