A broker is an individual or firm that acts as an intermediary between an investor and a securities exchange. Because securities exchanges only accept orders from individuals or firms who are members of that exchange, individual traders and investors need the services of exchange members. Brokers provide that service and are compensated in various ways, either through commissions, fees or through being paid by the exchange itself.brokers may provide investors with research, investment plans and market intelligence. They may also cross-sell other financial products and services their brokerage firm offers, such as access to a private client offering that provides tailored solutions to high net worth clients. In the past, only the wealthy could afford a broker and access the stock market. Online broking triggered an explosion of discount brokers, which allow investors to trade at a lower cost, but without personalized advice.