Today, November 10, politicians, members of the Royal Family and veterans gathered for the annual Sunday Remembrance Service.
The Royals – including Harry, Meghan, William and Kate – conduct tributes at the Whitehall Cenotaph.
To mark this day, here is a reminder of the wars we remember on Remembrance Day and why we wear poppies.
Is Remembrance Day a World War or a World War?
Armistice Day, also called Remembrance Day, and Remembrance Sunday are actually two different things.
Remembrance Day commemorates the end of the First World War.
Famous, it is marked on the eleventh day of the eleventh month to the eleventh hour – with a silence of 11 hours observed throughout the country.
The Sunday of remembrance is different.
On this day, ceremonies are held in memorials, cenotaphs and churches all over the country, as well as abroad, while people gather to remember the people who served in all wars.
This includes the Second World War, the Falklands War, the Gulf War and the more recent conflicts in Afghanistan and Iraq.
Why are we keeping a Remembrance Day silence?
The first national silence in Britain took place on November 11, 1919 – a year after the First World War – when King George V asked to observe the silence at 11 o'clock.
He made this request so that the thoughts could be centered on the "respectful remembrance of the glorious dead".
Why is the poppy used as a symbol of Remembrance Day?
Poppies are used to remember those who gave their lives in battle, because it was the flowers that grew on the battlefields after the end of the First World War.
John McCrae, a soldier in World War I who lost his life in the conflict, captured images of poppy fields in the famous poem In Flanders Fields.
The poem ends with the lines:
"If you break faith with us who are dying
We will not sleep, although poppies grow
In Flanders. "
Since the end of the First World War, poppies have become a symbol of the memory of all those who died in the service of their country.
People started wearing a poppy after the founding of the British Royal Legion in May 1921.
At the time, poppies were silk and the Legion was sold, which allowed the creation of a factory in 1922, where former disabled soldiers could make more poppies.
The traditional red poppy has also had a new image – sometimes controversial -.
Some people might choose to wear a white poppy to commemorate lost lives in advocacy for peace.
There are other colorful poppies that we can also wear, such as purple, to pay homage to the dead animals.