What were the names of the two alliance systems during World War 1?

The two main alliance systems during World War I were the Allies and the Central Powers. The Allies primarily included France, Russia, and the United Kingdom, later joined by Italy and the United States, among others. The Central Powers consisted mainly of Germany, Austria-Hungary, the Ottoman Empire, and Bulgaria. These alliances were a key factor in the escalation of the conflict following the assassination of Archduke Franz Ferdinand.