Forex brokers are for-profit organizations. Some are big enough to sponsor multi million-dollar events such as Formula 1. The main income of the broker is through spreads. A Spread is the difference between the bid and the ask price. A currency pair, for example, EURUSD might have an exchange rate of 1.1110 but when you want to place a buy position you buy at 1.1113 and a sell position at 1.1108. This difference between the bid and ask price is called the spread. Depending on your broker, the spreads may vary. Some brokers are really greedy, and this difference is pretty high, so before you choose a broker make sure you are fully aware of the spreads the broker charges.