Upselling is a sales technique where customers are encouraged to purchase a more expensive version of a product or add additional features or services. In e-commerce, this could mean suggesting a premium skincare set instead of a basic one or recommending an upgraded laptop model. Upselling not only increases the average order value but also helps customers get more value from their purchase. When done right, it feels helpful—not pushy—enhancing both the shopping experience and business profitability.