The AUD (Australian Dollar) is the official currency of Australia and is widely used for international trading and investments. It is a major currency and is often used as a reserve currency by many countries. In the financial markets, the AUD is used to measure the value of commodities and investments denominated in Australian dollars. It is also used to measure the performance of global markets, as well as to hedge against currency fluctuations and provide liquidity to investors. The AUD is also used to trade stocks, bonds, and other financial instruments. As such, it is an important part of the global financial system.