Cross-selling involves offering a customer a complementary product, accessory, or service related to their main purchase. This technique aims to enhance the shopping experience by suggesting related items, such as shoe polish with a pair of shoes or a tie with a shirt. It is generally offered proactively by a salesperson, but can also be automated on e-commerce platforms or in large retail stores without direct intervention.

Cross-selling, also known as upselling, involves offering a complementary product, either during or after a purchase, to increase sales by raising the total transaction amount. Originally, this technique was primarily used in physical stores, where a salesperson would suggest additional products. A classic example of cross-selling was selling a tin of shoe polish with the purchase of shoes, or suggesting a shirt or tie with a suit.

In the retail sector, cross-selling can take various forms. It can also be fully automated on an e-commerce platform, thus offering a personalized customer experience. In French, the term cross-selling is translated as "vente complémentaire" or "vente croisée," and it differs from upselling.

A humorous and illustrative example of an extreme approach to cross-selling in a store involves a salesperson or point-of-sale advisor.

Cross-selling, also known as cross-selling, involves offering existing customers products or services that complement those they have already purchased. This strategy aims to strengthen customer loyalty by offering related deals that may interest them. In short, cross-selling is an effective marketing practice based on proposing additional products or services relevant to an existing customer base.

When a customer shows interest in a product on a website, a marketing technique is used to suggest a range of other products that could complement their initial purchase. This process aims to increase the average order value and highlight items that might otherwise go unnoticed. Companies use this strategy to target their audience when launching a new product. For example, a beauty company could leverage data gathered from the previous marketing of a shampoo to then recommend a conditioner to its customers.