Australia Day is the official national day of Australia. Celebrated annually on January 26, it marks the arrival of the First Fleet of British ships at Port Jackson in 1788, and the claiming of this region in Australia's East Coast by Governor Arthur Phillip. It is a day of deep importance in Australian history, as it signifies the beginning of European settlement and significant transformation of the aboriginal landscape.

On Australia Day, Australians celebrate their country's rich history, diverse society, and national pride. Activities range from community barbecues, sporting competitions, and parades to ceremonies for Australian Citizenship and the announcement of the Australian of the Year. Australia Day is a public holiday throughout the country, with the majority of Australians getting the day off work to join in the festivities.

However, it must be noted that Australia Day is also known for its controversy. The day has been referred to as 'Invasion Day' by some due to the negative impact the arrival of the First Fleet had on the indigenous population. Debates about changing the date of Australia Day have sparked, as some feel it would be a step towards reconciliation with Aboriginal and Torres Strait Islander people. Despite these controversies, the holiday remains a major celebration of what it means to be Australian.