The theory follows sequences of five waves, or five up and down price movements which are then countered by a corrective 3 wave pattern in the opposite direction. The 5 impulsive waves are with the trend, whereas the 3 corrective waves are counter trend. In an 'up' move, there will be three up waves (movements 1, 3 and 5) and two down waves (movements 2 and 4).
An investor can profit from the difference between two interest rates in two different economies by buying the currency with the higher interest rate and shorting the currency with the lower interest rate. Prior to the 2008 financial crisis, it was very common to short the Japanese yen (JPY) and buy British pounds (GBP) because the interest rate differential was very large. This strategy is sometimes referred to as a "carry trade."
Currencies are traded as pairs, and the movement of currency pairs measure the value of one currency against another. For instance, the EURUSD currency pair measures the value of the Euro against the US dollar. When the value of the pair increases, this means the value of the Euro has increased against the value of the US dollar. When the value of the pair decreases, this means the value of the US dollar has increased (or the value of the Euro has fallen).
Currency and exchange were important elements of trade in the ancient world, enabling people to buy and sell items like food, pottery, and raw materials.[9] If a Greek coin held more gold than an Egyptian coin due to its size or content, then a merchant could barter fewer Greek gold coins for more Egyptian ones, or for more material goods. This is why, at some point in their history, most world currencies in circulation today had a value fixed to a specific quantity of a recognized standard like silver and gold.
One of the most unique features of the forex market is that it is comprised of a global network of financial centers that transact 24 hours a day, closing only on the weekends. As one major forex hub closes, another hub in a different part of the world remains open for business. This increases the liquidity available in currency markets, which adds to its appeal as the largest asset class available to investors.

If you're day trading a currency pair like the GBP/USD, you can risk $50 on each trade, and each pip of movement is worth $10 with a standard lot (100,000 units worth of currency). Therefore you can take a position of one standard lot with a 5-pip stop-loss order, which will keep the risk of loss to $50 on the trade. That also means a winning trade is worth $80 (8 pips x $10).
By shorting €100,000, the trader took in $115,000 for the short-sale. When the euro fell, and the trader covered their short, it cost the trader only $110,000 to repurchase the currency. The difference between the money received on the short-sale and the buy to cover is the profit. Had the euro strengthened versus the dollar, it would have resulted in a loss.
Trading psychology is by far, the most overlooked aspect of profitable trading.  To say it another way, you can use many strategies to turn a consistent profit, but you cannot trade profitably if you have yet to master the emotional side of trading. There is no exception to that rule. You cannot turn a profit while revenge trading. You cannot turn a profit if you’re over-leveraging and doubling down to
A foreign exchange option (commonly shortened to just FX option) is a derivative where the owner has the right but not the obligation to exchange money denominated in one currency into another currency at a pre-agreed exchange rate on a specified date. The FX options market is the deepest, largest and most liquid market for options of any kind in the world.

On 1 January 1981, as part of changes beginning during 1978, the People's Bank of China allowed certain domestic "enterprises" to participate in foreign exchange trading.[51][52] Sometime during 1981, the South Korean government ended Forex controls and allowed free trade to occur for the first time. During 1988, the country's government accepted the IMF quota for international trade.[53]
Unlike stock markets, which can trace their roots back centuries, the forex market as we understand it today is a truly new market. Of course, in its most basic sense - that of people converting one currency to another for financial advantage - forex has been around since nations began minting currencies. But the modern forex markets are a modern invention. After the accord at Bretton Woods in 1971, more major currencies were allowed to float freely against one another. The values of individual currencies vary, which has given rise to the need for foreign exchange services and trading.