Preface
（重定向自Proem）
A preface (/ˈprɛfᵻs/) or proem (/ˈproʊɛm/) is an introduction to a book or other literary work written by the work's author. An introductory essay written by a different person is a foreword and precedes an author's preface. The preface often closes with acknowledgments of those who assisted in the literary work.