Marketing intermediaries are companies that help in the selling, promotion, and distribution of products to a firm's final buyers.
Intermediaries include such groups as:
Resellers--(includes distribution channel firms that help the company find and/or sell to final buyers).
Distributors--These are the companies that help to warehouse (store and protect goods) and move goods to their destinations.
Advertising/marketing services--Advertising agencies, marketing research firms are companies that supply the help to promote products by targeting/reaching/communicating with prospects for products and services.