Cross-selling is a sales technique that involves recommending related or complementary products or services to customers based on their initial purchase. The goal of cross-selling is to increase the overall value of a sale by encouraging customers to buy additional items that enhance or complement their primary purchase. For example, a customer buying a laptop might be offered a carrying case, extended warranty, or software package. Cross-selling can improve customer satisfaction by providing more comprehensive solutions and can significantly boost revenue by increasing the average transaction value.