Ideologies are sets of beliefs, values, and ideas that shape how individuals and societies understand the world and their place within it. During World War II, ideologies played a pivotal role in shaping the motivations and justifications for the actions taken by various nations, including the rise of fascism, communism, and liberal democracy. These competing ideologies not only influenced military strategies but also drove propaganda efforts aimed at rallying support for war efforts and dehumanizing opponents.