The foreword (not forward) of a book is a short note at the beginning of a book that usually tells us how the book originated. Alternately, a foreword is a short introductory note written by someone other than the author.
The preface is a statement written by the author about the book’s objective or purpose.
An introduction, which can be written by the author or another person, follows the foreword and preface and tells the reader what to expect in the book.