Theme call the subject of a talk a piece of writing a person's thoughts or an exhibition of a topic
"Theme" is defined as "The subject of a discourse, a piece of literature, a person's thoughts, or an exhibition; a topic" in the Oxford Dictionary. A book's theme is typically a concept or lesson that permeates every aspect of the narrative. It might teach us a lesson about a particular aspect of life or the kind of person we might run into.
Regardless of whether it is an academic or educational work or something created for entertainment, every work of literature or art you come across has a central theme. Similar to regular books, graphic novels have a central theme.
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The answer is It tells the reader what will be discussed.
I will need a story to look at to answer this...