What are the styles used in Animal Farm?
Orwell uses satire to poke fun at governments that have to much power in hopes people will recognize the danger of this and not let their government become too powerful. He pokes fun of other ideas such as revolutions, communism, and countries that don't make education a priority.
He also uses allegory as a way to symbolically tell the story in an indirect way. This way people can interpret his story as they wish without him being pinned down to a specific meaning.
He also writes Animals Farm as a fable. This could be to simplify the story to draw the interest of the younger generation. As a fable it reads easier than a textbook on Russian history.