The king always owes his success to his mentors and advisors, the advisors who feed him all the information regarding a particular subject, offers him counsel, tells him ways to overcome a problem and strike gold at the perfect time. The stock broker does the same! Before we get into the mechanisms of how a stock broker and a trader works let me clarify how these two entities are different.
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A trader is someone who is involved in the buying and selling of shares and he himself is the owner of all those shares. He plays by himself. The stock broker, on the other hand, is someone who helps the trader play the game efficiently. He works as an intermediary between the trader and the market. Like a counselor, he provides the trader all the necessary information and gives advice on which stocks to buy and sell and exactly at what point of time to do that. He represents the client, the trader, and seeks the best deal for him. The primary role of the stock broker in investing is to act as a vehicle through which the trader either buys or sells the stocks.
Often, the word “stock brokers” refers to corporations like TD Ameritrade, Charles Schwab, E*TRADE, and many other organizations that can buy stock on the trader’s behalf. Stock brokers can be individuals who work for such firms as well. Apart from providing advisory services, stock brokers often offer limited banking services like electronic deposits and withdrawal, credit and debit cards, interest bearing accounts etc. The stock broker usually has a much detailed data of the stock market available to her than the trader. The incentive of the stock broker is the little margins he gets with every transaction. They are paid on commission, a percentage of the value of the trade. So, yes, the success of the stock broker is intricately associated with that of the trader; the more profit the trader makes, the more does the stock broker. You can also imagine the stock broker to be like a lawyer; the lawyer represents you in the court, the stock broker does so in the stock market. The final decision is of course taken by the trader (he is the owner of the stocks!) but the stock broker helps him to take it.
So you see, behind every successful trader there is (most probably) a stock broker!