Citation:
Metaphors are figures of speech that make a comparison between two unrelated things, highlighting the similarities between them. They do not use "like" or "as" to make the comparison.
Similes are also figures of speech that make comparisons, but they use "like" or "as" to establish the connection.
Symbolism is the use of objects, characters, or actions to represent abstract ideas or qualities.
Allegory: Allegory is a narrative technique where characters and events represent abstract ideas and moral principles.