An alliance is an agreement between two or more countries to help each other. To increase their own nations’ security, European powers signed treaties with one another forming alliances. Alliances are agreements between nations stating that each country will assist the other if they are attacked. On the verge of World War I, there were two large alliances. One alliance was called the Triple Entente (French for alliance), sometimes called the “Allied Powers” and it consisted of the United Kingdom (Great Britain), France, and Russia. In addition, Russia was allied with some Slavic countries in the area of Europe known as the Balkans including Serbia. The other was called the Triple Alliance and is sometimes referred to as the “Central Powers” these included Germany, Austria-Hungary, and Italy. As the war continued, the Ottoman Empire joined this group and Italy left this alliance to join the other Triple Entente.