Stands for business-to-business (B2B).

B2B marketing consists of a business, like a marketing agency, selling products or services to another businesses, or organization.

For example, a digital marketing agency may sell Conversion Rate Optimization (CRO) services to a t-shirt website retailer looking to optimize its website to sell more t-shirts.

The agency is selling its services to another business.

This business model differs from B2C -- which refers to a business, like a t-shirt retailer, selling t-shirts directly to customers.