Summarize a phenomenon or an event, the content of a party and an event, and discuss the cause and effect of the facts in detail. Generally appear in a chapter, but not absolutely.

foreword

Introduction to book ideas. It is usually the first chapter of a book, which summarizes the meaning of the book. The introduction will talk about some basic concepts of this course, as well as the method and practicability of this course, the focus and prospect of this course.

General: the part written in front of a book or an article, similar to a preface or introduction, as an overview or feeling of the book, and also refers to the opening remarks of a symposium, seminar and symposium. Also known as preface, preface or general introduction, it is often used as the beginning of scientific and technological papers to put forward the problems to be studied in the paper and guide readers to read and understand the full text.