Authors use unreliable narrator to engage readers on a deeper level, compelling them to come to their own conclusions when the narrator's point of view can not be trusted.
Unreliable narrator is that storyteller who withholds information, lies or misleads the reader and casting doubt on the narrative.
The unreliable narrator allows the writer to hide the information from the reader that is later on revealed either through the accumulation of clues that contradict the narrator or in a shocking reveal.
A narrator that is not trustworthy and whose rendition of events must be taken with a grain of salt is called unreliable narrator.
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