What is the purpose of allusion ?

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What is the purpose of allusion? 

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2 Answers

  1. Allusions enable the readers/viewers to understand new information like characters, plot, and setting by connecting it to something already known.

  2. An allusion can be used as a straightforward device to enhance a text by providing further meaning, but it can also be used in a more complex sense to make an ironic comment on one thing by comparing it to something that is dissimilar.