Stockbrokers are people who deal with stock & bonds.
A stock broker sells or buys stock on behalf of a customer. The stock broker works as an agent matching up stock buyers and sellers. A transaction on a stock exchange must be made between two members of the exchange - a typical person may not walk into the New York Stock Exchange (for example), and ask to trade stock. Such an exchange must be done through a broker.
In addition to actually trading stocks for their clients, stock brokers may also offer advice to their clients on which stocks, mutual funds, etc. to buy.
