As mentioned earlier, in a long trade (also known as a buy trade), a trader will open a trade at the bid price, and will aim to close the trade at a higher price, making a profit on the difference between the opening and closing value of the currency pair. So if the EUR/USD bid price is 1.16667, and the trade closes at the price of 1.17568, the difference is 0.00901, or 90.1 pips. (When trading a single lot, that would make a 901 USD profit).
Trading currencies is the act of making predictions based on minuscule variations in the global economy and buying and selling accordingly. The exchange rate between two currencies is the rate at which one currency will be exchanged for another. Forex traders use available data to analyze currencies and countries like you would companies, thereby using economic forecasts to gain an idea of the currency's true value.
Despite being able to trade 24 hours a day, 5 days a week, you shouldn’t (Forex trading is not quite 24.7). You should only trade a forex pair when it’s active, and when you’ve got enough volume. Trading forex at weekends will see small volume. Take GBP/USD for example, there are specific hours where you have enough volatility to create profits that are likely to negate the bid price spread and commission costs.
By contrast, the AUD/NZD moves by 50-60 pips a day, and the USDHKD currency pair only moves by an average of 32 pips a day (when looking at the value of currency pairs, most will be listed with five decimal points. A 'Pip' is 0.0001. So, if the EUR/USD moved from 1.16667 to 1.16677, that would represent a 1 pip change). The major Forex pairs tend to be the most liquid, and therefore provide the most opportunities for short-term trading.
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.