Broker
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In commerce, a broker is a party that mediates between a buyer and a seller. A broker who also acts as a seller or as a buyer becomes a principal party to the deal. Distinguish agent: one who acts on behalf of a principal.
A brokerage is a firm that acts as a broker.
See also:
In computing, a broker consists of software which mediates between two objects: typically between a client and a server or between a repository and a requestor or caller. See for example: