Australia has no official language but English is the de facto national language. The main points covered in the document include: - Australia has a population of over 22.5 million and governs an entire continent, making it the largest island and 6th largest country. - English is the main language and some key facts about Australia's flag, national anthem, and political system. - Comparisons are made between the cultures and traditions of Australia and Vietnam regarding religion, sports, celebrations, greetings, cuisine and dining customs.