It marks the day World War One ended, at 11am on the 11th day of the 11th month, back in 1918. Nowadays, people remember those who were lost in the war by holding a two-minute silence and by wearing a red poppy.
The first two-minute silence in Britain was held on 11th November 1919, when King George V asked the public to observe a silence at 11am. This was one year after the end of World War One. He made the request so “the thoughts of everyone may be concentrated on reverent remembrance of the glorious dead”.