Cross-selling is the act of offering additional products or services to a customer who is already making a purchase from a business. There are varied alternatives to use instead of the term "cross-selling". Some popular synonyms include "upselling", meaning offering a more expensive or upgraded version of the product or service being purchased, "complimentary selling," which involves suggesting products that complement the customer's current purchase, and "add-on selling," where a business offers additional products or services that enhance the experience of the initial purchase. Other synonyms for cross-selling include "bundle selling," "supplementary selling," and "related product selling". Ultimately, whatever words are used, the goal of cross-selling remains of building strong customer relationships and increasing revenues.