Forex is more suitable to be called speculation, because we are required to think quickly, so as not to be late in taking buy / sell action. Being late in taking action causes the opportunity for profit to be lost, it can also be a loss because it is time to take a buy/sell trading action that is too late. You can invest with forex, but not through a broker, invest by buying forex at a bank, nowadays many banks provide savings accounts in dollars and other foreign currencies.