​Remembering the war veterans: What is Anzac day and why is it observed on April 25?

Anzac Day is a national day of remembrance in Australia, New Zealand and Tonga that commemorated all Australians and New Zealanders who served and died in all wars, conflicts, and peacekeeping operations. Veterans march to honour the day in Nelson Bay, Australia. (Image: AP)

It is observed on 25 April each year to honour the members of the Australian and New Zealand Army Corps (ANZAC) who served in the Gallipoli campaign, their first engagement in the First World War. A honor guard officer saluted the martyrs of World War one. (Image: AP)

This year marked the 110th year of remembrance. Anzac Day originally marked the nations' role in a campaign to capture the Gallipoli Peninsula in Turkey during World War one, which resulted in 130,000 deaths on both sides of the conflict. Officers in the honour guard are reflected in the monument during the Anzac Day commemorations. (Image: AP)

Hundreds of thousands of people gathered across Australia and New Zealand on Friday for dawn services and street marches to commemorate their war dead. In Sydney, Australia, participants were assisted as they marched past thousands lining the streets to pay tribute during the Anzac Day parade. (Image: AP)

New Zealand Prime Minister Christopher Luxon (third left) travelled to Gallipoli in Turkey to commemorate the 110th anniversary of the landing day. (Image: AP)

The service was also attended by King Charles III 's sister Princess Anna. This image was captured during a ceremony near Canakkale, Turkey. She left flower wreaths to remember the heroes. (Image: AP)

New Zealand soldiers stood during the international service to commemorate the day, and scouts participated in the parade. (Image: AP)

Veterans saluted during the Anzac Day commemorations to honour their fallen comrades. Several were seen getting emotional during the parade. (Image: AP)

Turkish Janissary band members paraded to commemorate the day. This band is a distinctive Ottoman military band renowned for its powerful percussion and shrill wind instruments (Image: AP)

People watched the Soloturk fighter show after the rally in Turkey. Soloturk is a single aircraft aerobatic demonstration team of the Turkish Air Force's 132nd Squadron based at the Konya Air Base. (Image: AP)

A French officer placed a carnation on a grave of a countryman soldier followed by the parade at a French cemetery in Turkey. (Image: AP)