Every year the country comes together for Remembrance Day, also known as Armistice Day.
Remembrance Day marks the day World War One ended, at 11am on the 11th day of the 11th month, in 1918.
A two-minute silence is held at 11am to remember the people who have died in wars around the world.
Many people choose to wear a poppy in November for Remembrance Day to show respect for the people who died fighting in the First World War and the conflicts that followed it.
The red poppy belongs to the Royal British Legion - a charity created by veterans of World War One.
They say that the red poppy represents remembrance and hope.