Animal Farm is an allegorical reference to the Russian Revolution and how it strayed off course. It starts with Old Major, who is a wise old boar, narrating his vision of freedom for the animals who are the working class. The old Major then dies without witnessing the realization of his dream. The pigs pick up the mantle and formalize the teachings into a system, called Animalism, which is based on seven commandments. The commandments spur the animals into rebellion leading to the overthrow of humans.
George Orwell constructs a vivid picture of how the social order readjusts its balance after the Revolution takes place. In society, there is always one class, the elites represented by pigs, who carve their way to power while the masses or the sheep bray and follow their mantra. There is also Boxer, the horse, who represents the labour. He works hard until one day his utility runs out and he is retired to the knackers. We come across Benjamin the donkey, who is apathetic and unconcerned.
Orwell makes brilliant use of satire to expose the dichotomy of a totalitarian regime posing as a welfare state. For example, the initial commandment "All animals are equal" is revised to "All animals are equal but some animals are more equal than others." Similarly, a pig aptly named Squealer is used to spread propaganda and seed doubt in the minds of animals regarding initial resolutions passed.
This is one of my favourite books and in my opinion, more impressionable than 1984 by the same author. Fans of political satire would love this book.