Some facts about FOREX
Forward transaction: One way to deal with the Forex risk is to engage in a forward transaction. In this transaction, money does not actually change hands until some agreed upon future date. A buyer and seller agree on an exchange rate for any date in the future, and the transaction occurs on that date, regardless of what the market rates are then.
Investors before could create multiple bank accounts, each one denominated in a different currency, and transfer funds from one account to another in order to profit from fluctuating exchange rate. This was troublesome, however, because the transaction costs incurred were large due to the small quantity of funds being converted relative to the size of the market. This transaction type was at the very bottom of the forex pyramid.
Forex trading is always done in currency pairs.