What are blue books, white papers, green books, yellow books, black books and red books? Is there any difference between the two?

Another name for an important document or report with a blue cover officially published by the government or parliament.

There is no difference in nature between leather books of various colors, but it is determined by the cover color.

Documents in different countries have their usual colors, and the cover is white, which is called white paper; The cover is blue, called blue book; The red one is called the little red book; Use yellow, called yellow book; Use green, called green book, etc.

Among them, the white paper and blue book are the most widely used, especially the white paper has become an internationally recognized official document. However, a country can use multiple document cover colors. For example, Japan's annual defense report uses a white paper, called the defense white paper, while its annual diplomatic report uses a blue book, called the diplomatic blue book.