The difference between forward foreign exchange options and futures foreign exchange options lies in: the former is a non-standardized contract, not traded on the exchange, and does not need to pay a deposit; The latter is a standardized contract for exchange transactions and requires a certain margin.

The difference between foreign exchange options and the former two is that foreign exchange options give investors the right to decide whether to buy or sell foreign exchange in the future. If the option is beneficial to investors when it expires, it will be executed, otherwise it will not be executed. The first two must execute futures/forward contracts at maturity, regardless of whether it is beneficial for investors to execute contracts at maturity.