It's only to convert cash into other currencies but it can be a way to learn forex trading which is very difficult. I would not attempt any of the short term strategies you may use in equities.
IMO there are many hidden risks of trading on a broker platform like those provided by most FX brokers, these are not true markets. Here is what can potentially happen on IDEAL for ex:
US markets are closed, market is 1.1035/1.1115 , interbank is 80/85, spread would usually be tighter but you try to get an execution now because you think it could move big later in the day. So you offer 5,000 euros at 1.1090. Someone (IB?) buys 10 euros from you! Then they offer 10,000 at 1.1088. You just paid $2.95 to sell 10 euros and you have to modify your order if you want to have a chance of getting an execution! You could end up doing this several times before you are done with your order and IB pockets the commission each time.