Australia, officially known as the Commonwealth of Australia, is a sovereign country comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands. It is the largest country in Oceania and the world’s sixth-largest country by total area. Australia’s capital is Canberra, and its largest city is Sydney. Consists of total six states: Western Australia, New South Wales, Queensland, South Australia, Tasmania, Victoria and three internal territories: the Australian Capital Territory (ACT), the Northern Territory, and the Jervis Bay Territory. The country’s other major metropolitan areas are Melbourne, Brisbane, Perth, and Adelaide.

Australia is a highly developed country, with the world’s 14th-largest economy. It has a high-income economy, with the world’s tenth-highest per capita income. It is a regional power and has the world’s 13th-highest military expenditure. Immigrants account for 30% of the population, the highest proportion in any country with a population over 10 million. Having the third-highest human development index and the eighth-highest ranked democracy globally, the country ranks highly in quality of life, health, education, economic freedom, civil liberties, and political rights, with all its major cities faring well in global comparative livability surveys. Australia is a member of the United Nations, G20, Commonwealth of Nations, ANZUS, Organization for Economic Co-operation and Development (OECD), World Trade Organization, Asia-Pacific Economic Cooperation, Pacific Islands Forum, and the ASEAN Plus Six mechanism.