Up-selling is a sales technique where a seller encourages a customer to purchase a more expensive item or add-ons to enhance their original choice. This strategy aims to increase the overall value of the sale while providing the customer with additional benefits or features that may better meet their needs. For example, when buying a smartphone, a salesperson might suggest a higher model with better specifications or recommend accessories like a protective case or wireless earbuds. Up-selling can improve customer satisfaction by offering products that enhance their experience while also boosting the seller's revenue.