Axis power, also known as the Rome-Berlin-Tokyo Axis, includes Germany, Italy, and Japan. The axis nations fought together in the Second World War against the Allies.
The Axis power and the Allies power were the two biggest forces during the Second World War. This union was formed so Germany, Italy, and Japan could secure their personal interest.
However, the Axis power never organized for the foreign or military policy or any other activities. They believed they were unstoppable, and in their vision, Italy ruled over the Mediterranean Sea, Germany ruled over Europe and Japan over the Pacific and East Asia.
The treaty was signed in October 1936 by Germany and Italy, and then in November 1963, the Anti-Comintern pact between Germany and Japan was signed.