This is a special facility where at certain hours (exchange session - see) trade transactions occur. On that exchange, national currencies (see) are freely bought and sold and the price of each of them (or more precisely, the ratio of rates) is changing every second, from deal to deal. This price, which is called the quote (see), is modified by the demand for currency and actual offers. So, the more popular the currency, the more reliable and more traders will be interested in it (see), the more expensive it will be in relation to other monetary units.
Trading in financial markets involves substantial risks, including complete possible loss of investment capital. This activity is not suitable for all investors. High leverage increases the risk (Risk Disclosure).