1. Foreword: Foreword is an article placed before the text of a book, that is, the introduction, evaluation and explanation written by the author or others in a book or paper.
2. Preface: Preface is a short essay written by the author at the beginning of a paper or a book, which is mainly used to explain the ins and outs of this study to readers, arouse their interest in this paper, and outline and guide their reading interest in the text.
3. Introduction: Introduction is a part of the opening of academic works, which is mainly used to summarize the contents, research points and methods of the works. Its purpose is to let readers have an overall understanding of the works and stimulate readers' interest in reading.
4. Introduction: Introduction is the part placed before the text of a book or paper, that is, guiding the reader into the text of a book or paper. It mainly plays the role of guidance and guidance, helping readers to better understand and appreciate the text.
In short, preface, preface, introduction and introduction are all words used to guide readers into books or papers, but their status, functions and purposes are slightly different.