Business –

A broker is a party that mediates between a buyer and a sales|seller. A broker who also acts as a seller or as a buyer becomes a :wikt:principal|principal party to the deal. Distinguish Agent (law)|agent: one who acts on behalf of a principal. A «brokerage» or a «brokerage firm» is a business that acts as a broker. A Stock broker|brokerage firm is a business that specializes in trading stocks. A sales person working for a securities or commodity brokerage firm is popularly (but incorrectly) called a «broker.» A broker in that context is, strictly speaking, an exchange member who is actually executing the purchase or sales order in the ‘pit’, on the exchange, as a service to the client of the firm for which that salesman works.