What is the difference between World War II and Nazism?

World War II was a war. Nazism was a political movement.

Nazism was a political party in Germany from about 1930 to 1945.

http://kids.britannica.com/elementary/article-353523/Nazi-Party

World War II was a deadly war that was fought by many countries from 1939 to 1945. During the war millions of civilians, including Jews and Roma were mercilessly murdered.

http://www.ducksters.com/history/world_war_ii/

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World War II and Nazism are related, but they represent different concepts.

World War II was a global military conflict that lasted from 1939 to 1945. It involved most of the world's nations, divided into two opposing military alliances: the Allies (including the United States, United Kingdom, Soviet Union, and others) and the Axis powers (led by Nazi Germany, Italy, and Japan).

On the other hand, Nazism was an ideology and political movement primarily associated with Adolf Hitler's regime in Germany during the 1930s and 1940s. Nazi Germany was governed under the ideology of Nazism, which was characterized by extreme nationalism, racism, and authoritarianism. The Nazis believed in the superiority of the Aryan race and sought to establish a totalitarian state based on these principles.

In simple terms, World War II was the actual armed conflict that involved various countries, while Nazism refers to the ideology and regime of Hitler's Germany that played a substantial role in fueling the war.