World War I was a global war that took place between 1914 and 1918. It is also known as the Great War. World War I originated in Europe and was fought between two sides, the Allies and the Central Powers. The Allies included Great Britain, France, Russia, and eventually the United States and Japan. The Central Powers included Germany, Austria-Hungary, and Italy. The Allies were the victors of World War I, and the war became known as one of the deadliest conflicts in history.