All forex trades involve two currencies because you're betting on the value of a currency against another. Think of EUR/USD, the most-traded currency pair in the world. EUR, the first currency in the pair, is the base, and USD, the second, is the counter. When you see a price quoted on your platform, that price is how much one euro is worth in US dollars. You always see two prices because one is the buy price and one is the sell. The difference between the two is the spread. When you click buy or sell, you are buying or selling the first currency in the pair.
This is why many traders decide to employ gearing, also known as financial leverage, in their trading - so that the size of the trading position and profits could be higher. Let's assume a trader with 1,000 USD on their account balance wants to trade big and their broker is supplying a leverage of 1:500. This way a trader can open a position that is as large as 5 lots, when it is denominated in USD. In other words, 1,000 USD * 500 (the leverage), would equal a maximum size of 500,000 USD for the position. The trader can actually request their orders of 500 times the size of his deposit to be filled.
For retail clients, leverages of up to 1:30 for currency pairs and 1:20 for indices are available. For professional clients, a maximum leverage of up to 1:500 is available for currency pairs, indices, energies and precious metals. Both retail and professional status come with their own unique benefits and trade-offs, so it's a good idea to investigate them fully before trading. Find out today if you're eligible for professional terms, so you can maximise your trading potential, and keep your leverage where you want it to be!