What is ANZAC Day?

"ANZAC was the name given to the Australian and New Zealand Army Corps soldiers who landed on the Gallipoli Peninsula in Turkey early on the morning of 25 April 1915 during the First World War (1914-1918).

As a result, one day in the year has involved the whole of Australia in solemn ceremonies of remembrance, gratitude and national pride for all our men and women who have fought and died in all wars. That day is ANZAC Day - 25 April."
quoted from ANZAC Day Commemoration Committee website