Upselling is a sales technique used by businesses to persuade customers to purchase a more expensive, upgraded, or premium version of a product or service, or to add additional features or products to their purchase. The goal of upselling is to increase the revenue generated from each customer transaction and to encourage customers to purchase more from the business.

In practice, upselling may involve suggesting a more expensive product or service that better meets the customer's needs, offering add-ons or complementary products to enhance the customer's experience, or providing incentives or discounts for upgrading to a higher-tier product or service.

Upselling can be an effective strategy for businesses that want to increase their revenue and improve customer satisfaction by providing additional value. However, it is important to use upselling in a way that is ethical and transparent, and to focus on providing genuine value to the customer rather than simply pushing them to spend more money. Additionally, businesses should be careful not to oversell or pressure customers, as this can lead to negative customer experiences and decreased loyalty.