A broker is a person who will serve as an intermediary for a transaction, mostly financial, between two entities.
The broker activity was originally essentially destinated to the financial activitie (Insurance, stock exchange, Forex, etc.) but since few years it was extended to other activities (travel, real estate, etc.).
In the direct marketing it concerns intermediaries providing lists of prospects containing informations used for direct marketing campaign.
E-prospects might be considered as a online broker at the difference thet all the contacts provided are incoming qualified contacts who have expressed a clear need for the service or product offered by the company concerned.