B2B is short for “business to business.” It indicates sales made to other businesses, rather than sales to individuals. The latter is referred to as “business to consumer” sales.
B2B sales often take the form of one company selling supplies or components to another. For example, a tire manufacturer might sell to a car manufacturer. Wholesalers often sell their products to retailers, who then turn around and sell them to consumers. Supermarkets are a classic example: they buy food from wholesalers and then sell it at a slightly higher price to individuals.
Business-to-business sales can also include services. Attorneys who take cases for business clients, accountant firms that help companies do their taxes, and technical consultants who set up networks and email are all examples of B2B service providers.