The document discusses various types of distribution channels for consumer and business-to-business products. It outlines different channel structures including producer to consumer (Channel A), producer to retailer to consumer (Channel B), and producer to wholesaler to retailer to consumer (Channel C). It also discusses channels for business-to-business including producer to buyer (Channel E) and producer to agent to buyer (Channel F). Additionally, it mentions dual distribution channels, wholesale intermediaries, agents and brokers, and vertical marketing systems. Key factors for selecting distribution channels include organizational goals, market characteristics, product attributes, and environmental forces.