USD (United States Dollar) is the official currency of the United States, widely used in global trade and finance. AUD (Australian Dollar) is the official currency of Australia, also used in some of its territories, including Christmas Island and Norfolk Island. The symbols for the currencies are USD and AUD, respectively.

With 280 USD, you can purchase a variety of items such as a mid-range smartphone or several pairs of branded sneakers. The purchasing power of 280 USD can vary depending on the country or region due to exchange rates and cost of living differences.