The currency used in Australia is called the Australian dollar (AUD). It is represented by the symbol "$" or "A$", and is divided into 100 smaller units called cents. Banknotes in circulation include denominations of $5, $10, $20, $50, and $100, while coins in circulation include denominations of 5 cents, 10 cents, 20 cents, 50 cents, $1, and $2. The Australian dollar is widely used in international trade and investment, and is one of the major currencies in global finance.