Maybe I’m pedantic but “blurb” is not interchangeable with the terms: foreword, preface, introduction and afterword.
Blurb: a short description of a book, film, or other product written for promotional purposes.
Foreword: written by someone other than the author or editor and is usually someone with authority to lend credibility to your book, with their name appearing at the end.
Preface: discusses how the book came about, the scope of the book, why the book was written, its limitations, and any acknowledgments the author or editor has.
Introduction: differs from a preface and a foreword because it’s written by the author and does talk about the subject matter.
Afterword: found at the end of a piece of literature. It generally covers the story of how the book came into being, or of how the idea for the book was developed.