The most common form of trading is currency trading, otherwise known as forex trading. This is the act of buying one currency and selling another. Currencies are traded in pairs and these pairs fall under three categories; Majors, Minors and Exotics.
Major Currency Pairs
The Majors are the most popular and most liquid pairs and always have the US dollar as one half of the pair. Examples include the EUR/USD and the USD/JPY.