CFDs are a leverage product and can involve a significant risk of loss. Trading CFDs may not be suitable for all, therefore you should ensure that you understand the risks involved and take into account your individual circumstances.
Trader's Glossary

What is Base Currency?

The base currency is the first currency in a pair. The given exchange rate refers to how much of the second currency in a pair (the quote currency) is required to purchase a unit of the base currency.