On April 25, 1915 the first major military action fought by Australian and New Zealand forces during World War I -- it occurred in Gallipoli, Turkey.
Anzac Day is the anniversary and is commemorated each year in Australia, New Zealand and other countries around the world. ANZAC stands for the Australian and New Zealand Army Corps.
Although celebrated on the anniversary of the landing in Gallipoli, Anzac Day we also pay homage to the people who have died in wars to protect us.
The Red Poppy:
All over the world, the red poppy is worn by citizens in memorial of those who lost their lives serving their countries during wartime. Wreaths of red poppies are also displayed at memorials and gravesites. Poppies are worn for memorial days, remembrance days and veteran's days. Donations for the poppies go to support veteran's groups.
In Australia and New Zealand, the most common time of year to wear a red poppy is on Anzac Day. "Poppy Day" is usually the Friday right before Anzac Day (unless the Friday also happens to be Good Friday).