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.
When trading Forex, you'll see that both 'Bid' and 'Ask' prices are quoted. The bid price is the price at which you can buy the currency, while the ask price is the price at which you can sell it. If you are purchasing a currency in a trade, this is known as a long trade, and the hope is that the currency pair will increase in value, so that you can sell it at a higher price and make a profit on the difference.
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]
In a currency pair with a wider spread, such as the EURCZK, the currency will need to make a larger movement in order for the trade to become profitable. At the time of writing, the bid price for this pair is 25.4373, while the ask price is 25.4124, so the spread is 0.0200, or 20 pips. It's also not uncommon for this currency pair to have movements of less than 20 pips a day, meaning traders will likely need to perform a multi-day trade to make a profit.
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).
There is no unified or centrally cleared market for the majority of trades, and there is very little cross-border regulation. Due to the over-the-counter (OTC) nature of currency markets, there are rather a number of interconnected marketplaces, where different currencies instruments are traded. This implies that there is not a single exchange rate but rather a number of different rates (prices), depending on what bank or market maker is trading, and where it is. In practice, the rates are quite close due to arbitrage. Due to London's dominance in the market, a particular currency's quoted price is usually the London market price. Major trading exchanges include Electronic Broking Services (EBS) and Thomson Reuters Dealing, while major banks also offer trading systems. A joint venture of the Chicago Mercantile Exchange and Reuters, called Fxmarketspace opened in 2007 and aspired but failed to the role of a central market clearing mechanism.[citation needed]
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.

Traders can also make short trades (also known as sell trades), where they sell a Forex CFD at the ask price and, once the price drops, buy it at a lower bid price, and profit on the difference. In this case, if the GBP/USD ask price was 1.32265, and the trade closed at the price of 1.31203, the difference would be 0.01062, or 106.2 pips (which would amount to 1,062 USD in profit).
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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. 
Scalping is a higher frequency form of trading, wherein traders focus on lower time frames, trying to profit from the market's volatility. Very often, traders make 15-30 scalps per day, whereas the profit is usually between 5-15 pips. The risk with scalping is usually 2-5% per trade, but bear in mind that if you cross 5% of your risk threshold, your account will be in a danger zone.
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Imagine a trader who expects interest rates to rise in the U.S. compared to Australia while the exchange rate between the two currencies (AUD/USD) is .71 (it takes $.71 USD to buy $1.00 AUD). The trader believes higher interest rates in the U.S. will increase demand for USD, and therefore the AUD/USD exchange rate will fall because it will require fewer, stronger USD to buy an AUD.