The book "Animal Farm" by George Orwell is an example of an allegory. Allegories are used by poets and writers to explain abstract concepts. An allegory is often used to impart a moral, spiritual or political lesson to the reader.
In "Animal Farm," George Orwell uses animals to represent the Russian communist revolution that occurred before World War II. The animals represent various social sections that were created after the revolution.
An allegory is different from symbolism. An allegory uses characters or events to represent an idea. Symbolism does not tell a story; instead, it assigns an alternative meaning to an object.