B2B, acronym of Business-to-Business, is a business model used to describe business transactions that occur between two companies, as opposed to the B2C model. In this model, one company sells products, services or solutions to another company for use in its business operations or for resale to its own customers.

B2B transactions typically involve larger purchase volumes, more complex purchasing processes and long-term business relationships. Common examples of B2B transactions include the sale of raw materials, industrial equipment, business software and business-to-business consulting services.