The qualification for this award is simple: the lowest out-of-pocket costs. Tastyworks fits that bill well, as customers pay no commission to trade U.S. equities online, and there is no per-leg fee for options trades. Tastyworks has a unique fee structure for options trades, charging $1 per contract to open a position, while closing trades are free. In addition, there is a maximum of $10 per leg for options trades, so traders who place large spread orders are happy.
A broker is simply a licensed person through whom you can buy and sell these stocks. When you use an online platform, it essentially acts as an online broker. If someone wants to buy any product, he can contact a brokerage service. They would place an order and let him know the market price of the product. If the investor is interested, they would include a commission for themselves and process the order forward. If the user wishes to buy stock, the broker would forward his order to a stock exchange, which would approximately take 3 days to complete including the money exchange between the broker and the investor.