Australia officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent . The island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans.Neighbouring countries include Indonesia, East Timor, and Papua New Guinea to the north, the Solomon Islands, Vanuatu, and New Caledonia to the northeast, and New Zealand to the southeast.

Australia is a prosperous developed country with a multicultural society. It ranks highly in many international comparisons of national performance such as human development, quality of life, health care, life expectancy, public education, economic freedom and the protection of civil liberties and political rights.Australian cities rank among the world's highest in terms of cultural offerings and quality of life. It is a member of the United ,Commonwealth of Nations, OECD, APEC, Pacific Islands Forum and the World Trade Organization.On 1 January 1901, the six colonies became a federation and the Commonwealth of Australia was formed. Since Federation, Australia has maintained a stable liberal democratic political system and remains a Commonwealth realm. The population is 22 millions.