Question

what do you mean by preface​

Answer 1

Answer:

A written introduction to a book which explains what it is about or why it was written

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Answer 2

Answer:

Preface =

$a \: introduction \: at \: the \: beginning \\ of \: a \: book \: explaining \: it \: purpose , \\ \: thanking \: who \: had \: helped \: author$