I'm a little surprised you've not heard of this day, especially in recent days leading up to it - no offence taken sergey.
ANZAC day is the day when we remember the couragous men and women that paid the ultimate sacrifice, and for the brave service men and women that returned home from the conflict from battle grounds from all over the world.
ANZAC - Australian and New Zealand Arms Corps - were the troops that went to battle in Turkey, arriving in Gallipoli on the dawn of 25 April 1914, as requested by the British, as Australia was considered a colony of Britian. (thanks Britian).
Hundreds of brave young and I guess a little nieve young men disembarked from their boats moored under military order, at the banks of Gallipoli in darkness, to find they were left to climb extreamly steep slopes on the banks of the river. The Turks were very well prepared for this onslaught and were primed and ready to shoot the young soldiers as soon as their feet hit the land.
At a gathering to remember the fallen, especially at RSL clubs, the poem that Henry posted above is read.
Every one acknowledges this moment in silence and replies at the end by saying "Lest we Forget".
We must never forget their sacrifice.
Its a very important part of Australias history.