Broker
An agent that executes orders to buy and sell currencies and related instruments either for a commission or on a spread. Brokers are agents working on commission and not principals or agents acting on their own account. In the forex market, brokers tend to act as intermediaries between banks, bringing buyers and sellers together for a commission paid by the initiator or by both parties.
A broker is a person or firm who arranges transactions between a buyer and a seller for a commission when the deal is executed. A broker who also acts as a seller or as a buyer becomes a principal party to the deal. Neither role should be confused with that of an agent—one who acts on behalf of a principal party in a deal.