Cross-selling is a sales strategy in which other complementary products or services are sold in addition to the sale of the actual product.
In cross-selling, the nature of composite sales increases the revenue per customer. Companies with high cross-selling rates benefit from lower acquisition costs and have significantly higher customer loyalty. Companies that are successful
invest resources in generating comprehensive knowledge about their customers, so-called customer insight, in order to know and meet their additional wants and needs as well as possible. In e-commerce, for example, recommendations on Amazon are a tool to promote cross-selling.
In the same way, fashion online shops often automatically offer matching ties from the online range to go with the shirt purchased. From the customer's point of view, this customer behavior is referred to as cross buying.