1. The Triple Alliance: This alliance was formed in 1882 between Germany, Austria-Hungary, and Italy. It was primarily a defensive alliance, with each country agreeing to come to the aid of its allies if they were attacked.
2. The Triple Entente: This alliance was formed in 1907 between the United Kingdom, France, and Russia. It was not as formal as the Triple Alliance, but it was still significant because it brought together three of the most powerful countries in Europe.