This document provides an overview of business-to-business marketing. It discusses the key aspects of B2B markets including manufacturers/service providers, resellers, institutions, and government. It then outlines the six stages of the B2B buying process: need recognition, product specification, request for proposal, proposal analysis and supplier selection, order specification, and vendor performance assessment. It also describes the different roles in the buying center, organizational cultures, and buying situations. Key terms are defined in a glossary at the end.