This is a fable or childrens story conceived by George Orwell when he saw a small boy driving a large horse along a road, Orwell felt that if the horse could only comprehend that it was more powerful than the boy it would do its own thing instead of his bidding.
On Animal Farm is the story of how different farm yard animals unite following an enlightenment about their fate and oppression. The animals agree to an egalitarian and "share and share alike" constitution by which to govern their new arrangements while defending themselves from the expelled farmer's attempts to re-establish the old ways of doing business.
The constitution is inscribed for all to see with "All Animals Are Equal" leading the list, slowly as the farm yards pigs rise to assume the position of leaders they abandon each of these value statements, radically revising them to justify a return to the old ways of doing business which characterised the original farmer who they threw out.
Like his other books Orwell was disappointed in his own lifetime with how the books where received and interpreted, of Animal Farm which he described as a "simple fable" Orwell stated if its simple message about betrayal where not understood then the book had been a failure.
This is an important point because Orwell had dedicated his energies to making political writing an art form (consider
Penguin Great Ideas : Why I Write). In his time, and since, Animal Farm has been seen as a devastating criticism of egalitarianism, flawed values and even of the very hopes and optimism which give rise to change of government, particularly by revolution, like a cynical or conservative text book.
Orwell intended it to be much more straight forward, he supported the values which where at the heart of the Animals constitution, including that core commitment to equality, and considered the crucial moment in the storyline to have been consistently overlooked (that is the moment at which the Pigs decide no longer to share the harvest of apples, which the other animals do not suspect is the beginings of betrayal).
The story is a heart felt tale, populated by all sorts of characters who Orwell uses to characterise a range of human traits from nobility to the down right villainous, with a good pace and easily understood style of writing, it should appeal to adults or children alike. Likewise it should appeal to either the political/literary reader and general reader alike.