When trading in the forex market, you're buying or selling the currency of a particular country, relative to another currency. But there's no physical exchange of money from one party to another. That's what happens at a foreign exchange kiosk—think of a tourist visiting Times Square in New York City from Japan. He may be converting his physical yen to actual U.S. dollar cash (and may be charged a commission fee to do so) so he can spend his money while he's traveling. But in the world of electronic markets, traders are usually taking a position in a specific currency, with the hope that there will be some upward movement and strength in the currency they're buying (or weakness if they're selling) so they can make a profit. 

One of the best ways to learn about forex is to see how prices move in real time and place some fake trades with an account called a paper trading account (so there is no actual financial risk to you). Several brokerages offer online or mobile phone app-based paper trading accounts that work exactly the same as live trading accounts, but without your own capital at risk. There are several online simulators for practicing day trading and honing your forex trading strategy and skills.
Currency prices are constantly moving, so the trader may decide to hold the position overnight. The broker will rollover the position, resulting in a credit or debit based on the interest rate differential between the Eurozone and the U.S. If the Eurozone has an interest rate of 4% and the U.S. has an interest rate of 3%, the trader owns the higher interest rate currency because they bought EUR. Therefore, at rollover, the trader should receive a small credit. If the EUR interest rate was lower than the USD rate then the trader would be debited at rollover.
As the risk sentiment deteriorates, the riskier assets look weak, while the greenback and the Japanese yen are looking strong. The EUR/USD pair is looking bearish with the 1.1222 level offering support. The resistance levels are 1.1277, 1.1330, and 1.1517. The support levels are 1.1222, 1.1155, and 1.1089. The USD/JPY pair is looking bearish with both the currencies looking strong due to risk-off sentiment dominating the market. The resistance levels are 107.86, […]
The main participants in this market are the larger international banks. Financial centers around the world function as anchors of trading between a wide range of multiple types of buyers and sellers around the clock, with the exception of weekends. Since currencies are always traded in pairs, the foreign exchange market does not set a currency's absolute value but rather determines its relative value by setting the market price of one currency if paid for with another. Ex: US$1 is worth X CAD, or CHF, or JPY, etc.
In the futures market, futures contracts are bought and sold based upon a standard size and settlement date on public commodities markets, such as the Chicago Mercantile Exchange. In the U.S., the National Futures Association regulates the futures market. Futures contracts have specific details, including the number of units being traded, delivery and settlement dates, and minimum price increments that cannot be customized. The exchange acts as a counterpart to the trader, providing clearance and settlement.