What is the difference between allegory and symbolism?

Allegory and symbolism are similar, but they have one key difference.

In a narrative that uses symbolism, the symbol is a singular element that adds to the greater story. When a narrative is an allegory, nearly every plot element represents something in the story.

For example, the green light in The Great Gatsby is an example of symbolism because it’s a single element within the bigger picture.

However, Plato’s Allegory of the Cave is an allegory because everything from the cave to the people, fire, shadows, and chains—basically, all of the major elements of the narrative—represents something to form the bigger picture.

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