Today is Armistice Day. The people around the world remember the day in 1918 when the two sides in World War I signed an agreement to stop fighting.
People, usually officials, lay wreaths of flowers on war memorials.
Everyone in the UK stops what they're doing at 11 o'clock in the morning for a two-minute silence. They also wear poppies to show they remember the people who fought in wars.
A lot of people in Serbia wear a special badge which shows Natalie's Ramonda, a purple flower representing the country's ability to survive problems, and the green Albanian Commemorative Medal.
