It is possible to trade Forex without a broker. If you have enough money, you can go directly to the bank and ask them to allow you to trade on the interbank market. Large banks can provide access, but it may save time if you are a small player. If you are a big player, they will charge you enough for entering, and you can trade directly. The Forex market is a place where you buy one currency and sell another. It's similar to exchanging currency at a currency exchange office but in smaller volumes.