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I agree with Lauren's answer: A prologue is anything before the main body of a text, and can be whatever the author wants it to be. What matters is that it reads well. However, in my experience, ...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/12676 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I agree with [Lauren's answer](https://writers.stackexchange.com/a/12675/26): A prologue is anything before the main body of a text, and can be whatever the author wants it to be. What matters is that it reads well. However, in my experience, an introduction, preface, or forward is usually written in the writer's or editor's voice; prologues are usually (but not always) part of the novel's story. All of these sections - along with acknowledgements, copyright page, title page, table of contents - can be referred to collectively as _front matter_.