Foreword in front of the directory is called preface, and behind the directory is called introduction.

Foreword, also known as preface, preface, narration, context, quotation and rumor, is written in front of a book or an article. The preface of the book, published before the text, mainly explains the basic content, compilation (translation) meaning, writing process of the book, academic value and translator's introduction. Written by translators, editors or others.

Basic meaning:

The preface of the paper, also called introduction, is a short paragraph written in front of the text to describe the author's psychology in writing this article, or his general understanding of this article. The preface is the preface of the paper, which aims to explain the ins and outs of this study to readers, arouse readers' interest in this paper, and play a role in outlining and guiding reading interest in this paper.