Stockbrokers also come in different forms.
Some are passive where they execute buy and sell orders of stocks (commonly called shares) on your behalf, where others actively contact you to provide their recommendation regarding shares to buy and sell. Others also manage derivative oriented portfolios for their clients.
To learn more about shares and derivatives, go to the Investment module.
With technological advancements, there are many on-line brokers where you can gather research and trade shares. The level of service you receive is likely to influence the way fees are calculated, and the amount paid.