The number quoted for these prices is based on the current exchange rate of the currencies in the pair, or how much of the second currency you would get in exchange for one unit of the first currency (for instance, if 1 EUR could be exchanged for 1.68 USD, the bid and ask price would be on either side of this number). Learn more about Forex quotes in this article: Understanding and Reading Forex Quotes.
The foreign exchange market is unique for several reasons, mainly because of its size. Trading volume in the forex market is generally very large. As an example, trading in foreign exchange markets averaged $5.1 trillion per day in April 2016, according to the Bank for International Settlements, which is owned by 60 central banks and is used to work in monetary and financial responsibility. 
Currency trading and exchange first occurred in ancient times.[4] Money-changers (people helping others to change money and also taking a commission or charging a fee) were living in the Holy Land in the times of the Talmudic writings (Biblical times). These people (sometimes called "kollybistẻs") used city stalls, and at feast times the Temple's Court of the Gentiles instead.[5] Money-changers were also the silversmiths and/or goldsmiths[6] of more recent ancient times.
Currency rates are representative of the Bloomberg Generic Composite rate (BGN), a representation based on indicative rates only contributed by market participants. The data is NOT based on any actual market trades. Currency data is 5 minutes delayed, provided for information purposes only and not intended for trading; Bloomberg does not guarantee the accuracy of the data. See full details and disclaimer.
The most common type of forward transaction is the foreign exchange swap. In a swap, two parties exchange currencies for a certain length of time and agree to reverse the transaction at a later date. These are not standardized contracts and are not traded through an exchange. A deposit is often required in order to hold the position open until the transaction is completed.
Risk/reward signifies how much capital is being risked to attain a certain profit. If a trader loses 10 pips on losing trades but makes 15 on winning trades, she is making more on the winners than she's losing on losers. This means that even if the trader only wins 50% of her trades, she will be profitable. Therefore, making more on winning trades is also a strategic component for which many forex day traders strive.

Analysis is absolutely vital to trading. Charts are helpful for both short and long-term trading. You should be looking at daily, weekly, and monthly charts. Fortunately, there are a number of different approaches to Forex analysis, which means every trader can find the right approach for them. The three broad categories of Forex analysis are fundamental analysis, technical analysis and wave analysis.

This phenomenon, which is used by Forex day traders, involves leveraging their capital in order to acquire an asset, and then getting rid of it as soon as the asset's price changes in a favourable direction. What day traders usually look for is a stock or a day trading currency which is highly liquid. Curious about the best Forex currency pairs for day trading?

For instance, if you opened a long trade on the GBP/USD currency pair, and the pair increased in value, the price limit at which the trade should close (the stop loss) would climb alongside the price of the currency pair. If the value of the GBP/USD then started to fall, the trade would be closed as soon as it hit your stop loss, preserving any profits you had made beforehand.
Due to Forex CFDs being leveraged, traders can access large portions of the currency market at a very low margin - sometimes as low as 1/500th of the size of the market they want to access (based on a leverage rate of 1:500). There are few additional costs as well - most Forex trading accounts have little (or no) commissions, order fees, and account management fees. If there are any trading fees, these are usually a markup the broker has added to the spread.
During the 15th century, the Medici family were required to open banks at foreign locations in order to exchange currencies to act on behalf of textile merchants.[10][11] To facilitate trade, the bank created the nostro (from Italian, this translates to "ours") account book which contained two columned entries showing amounts of foreign and local currencies; information pertaining to the keeping of an account with a foreign bank.[12][13][14][15] During the 17th (or 18th) century, Amsterdam maintained an active Forex market.[16] In 1704, foreign exchange took place between agents acting in the interests of the Kingdom of England and the County of Holland.[17]
Inflation levels and trends: Typically a currency will lose value if there is a high level of inflation in the country or if inflation levels are perceived to be rising. This is because inflation erodes purchasing power, thus demand, for that particular currency. However, a currency may sometimes strengthen when inflation rises because of expectations that the central bank will raise short-term interest rates to combat rising inflation.
When you trade forex, you're effectively borrowing the first currency in the pair to buy or sell the second currency. With a US$5-trillion-a-day market, the liquidity is so deep that liquidity providers—the big banks, basically—allow you to trade with leverage. To trade with leverage, you simply set aside the required margin for your trade size. If you're trading 200:1 leverage, for example, you can trade £2,000 in the market while only setting aside £10 in margin in your trading account. For 50:1 leverage, the same trade size would still only require about £40 in margin. This gives you much more exposure, while keeping your capital investment down.
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).
At the end of 1913, nearly half of the world's foreign exchange was conducted using the pound sterling.[24] The number of foreign banks operating within the boundaries of London increased from 3 in 1860, to 71 in 1913. In 1902, there were just two London foreign exchange brokers.[25] At the start of the 20th century, trades in currencies was most active in Paris, New York City and Berlin; Britain remained largely uninvolved until 1914. Between 1919 and 1922, the number of foreign exchange brokers in London increased to 17; and in 1924, there were 40 firms operating for the purposes of exchange.[26]
Spread: The spread is the difference between a currency pair's bid and ask price. For the most popular currency pairs, the spread is often low - sometimes even less than a pip! For pairs that aren't traded as frequently, the spread tends to be much higher. Before a Forex trade becomes profitable, the value of the currency pair must cross the spread.
Investment management firms (who typically manage large accounts on behalf of customers such as pension funds and endowments) use the foreign exchange market to facilitate transactions in foreign securities. For example, an investment manager bearing an international equity portfolio needs to purchase and sell several pairs of foreign currencies to pay for foreign securities purchases.
Forex is a portmanteau of foreign currency and exchange. Foreign exchange is the process of changing one currency into another currency for a variety of reasons, usually for commerce, trading, or tourism. According to a recent triennial report from the Bank for International Settlements (a global bank for national central banks), the average was more than $5.1 trillion in daily forex trading volume.