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Currencies are always traded in pairs, so the "value" of one of the currencies in that pair is relative to the value of the other. This determines how much of country A's currency country B can buy, and vice versa. Establishing this relationship (price) for the global markets is the main function of the foreign exchange market. This also greatly enhances liquidity in all other financial markets, which is key to overall stability.
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).
The benefit of choosing a regulated broker is that this will ensure that you, as a trader, are protected to the full extent of the law in your country. For instance, in 2018 the European Securities and Markets Authority (ESMA) introduced a range of legislation protecting retail trading clients, which all European Forex brokers must abide by. This legislation includes limits on available leverage, volatility protection, negative balance protection and more.