preface
nounUK /ˈprɛf.ɪs/
US /ˈprɛf.ɪs/
A short part at the beginning of a book that tells you what it is about.
She read the preface to learn why the author wrote the book.
OTHER MEANINGS
2. To begin or introduce something with a few words.
He prefaced his speech with a joke.
3. An introductory part of a speech or event.
The preface to the ceremony was a short welcome.
4. To come before something as an introduction.
A brief announcement prefaced the concert.