Remembrance Day is also known as Poppy Day, and in America it is called Veteran's day. It was first observed in 1919, however until 1945 it was called Armistice Day. Traditionally there is two minutes of silence at the eleventh hour of the eleventh day of the eleventh month because that was the time (in Britain) when the armistice became effective in 1918.
The app lets you display a poppy on your home screen. Nothing more, nothing less. Show that peace is important to you.