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As a global network, Internet has unique advantages in spreading information. With the rapid development of electronic publications, the networking of electronic publications has become a reality. Electronic publication refers to the mass media that stores pictures, words, sounds, images and other information in the form of digital codes on magnetic media, optical media and dielectric media, uses them through computers or similar devices, and can be copied and distributed. Types are: e-books, e-journals, e-newspapers and software books. With the development of the Internet, electronic publications in a narrow sense are regarded as books, periodicals, newspapers and other publications edited, published and disseminated completely under the network environment. E-books are the most common file forms in electronic publications, and their main carriers are disks and optical disks. E-books usually consist of a reader (computer) and a book card (CD or disk). Readers can not only read the contents of the book card page by page, but also quickly retrieve a large amount of information in the book. Internet will bring a bright future for e-books. I hope to show you some information about popular e-books in the world through this article.

E-books and e-books have many formats. Here we briefly introduce several popular and common e-book file formats:

1.EXE file format

This is a popular electronic reading file format, which is favored by many people. This format is also the most relevant production tool. Its biggest feature is that it is easy to read and easy to make. The produced e-book is quite beautiful and can be read without the support of a special reader. E-books in this format have low requirements for the running environment.

However, this format of e-books also has some shortcomings. For example, EXE files produced by most related production software do not support Flash, Java and common audio and video files, and need the support of IE browser.

2.CHM file format

CHM file format is a help file system based on HTML file features introduced by Microsoft in 1998, which is used to replace the early WinHelp help system. In Windows98, CHM files are called "compiled HTML help files". The JavaScript, VBScript, ActiveX, Java applet, Flash, common graphic files (GIF, JPEG, PNG) and audio and video files (MIDI, WAV, AVI) supported by IE browser are also supported by CHM, and can be linked to the Internet through URL.

The disadvantage of this format of e-books is that the reader's operating system must be Windows98 or above, and it also requires the reader's operating system to install Microsoft Internet Explorer 3.0 or above. If the operating system of the reader is still Windows 95, you need to install a program called CHM file reading upgrade package, hhupd.exe, with a size of about 700KB.

3.HLP file format

HLP file format is a help file system used by early operating systems. This format does not require much for the reader's operating system, and Windows 95 and later versions can run. The disadvantage of HLP file format is that it is not beautiful enough. Because many people now put forward higher requirements for the aesthetics of e-books, with the introduction of the Microsoft CHM help file system and the development of the operating system, the HLP file format has been replaced by CHM.

4.PDF file format

PDF file format is an electronic reading file format developed by Adobe company in the United States. E-books in this file format need the company's PDF file reader Adobe Acrobat Reader to read. Therefore, readers are required to install this reader on their computers. This reader is completely free and can be downloaded from the company website.

The advantages of PDF are beautiful appearance, convenient browsing and high security. However, this format does not support technologies such as CSS, Flash, Java and JavaScript based on HTML. So it is only suitable for browsing static e-books. However, importing pictures is supported. So if you want to read e-books with dynamic effects, PDF format is not your best choice.

E-books in PDF format can be made and edited by Adobe Acrobat, and the latest version is 6.0. We will introduce the software in more detail later, so I won't go into details here.

5.WDL file format

WDL is an electronic reading file format developed by Beijing Kang Hua Information Technology Co., Ltd. At present, many large electronic publications in China adopt this format. The file in this format is characterized by retaining the original layout. You can read e-books online or download them locally, but you need the company's dedicated reader, DynaDoc, for free. This reader can be downloaded for free from the company's website.

This format of e-books properly protects the interests of authors and publishers due to the restrictions on printing and reproduction.

1. Full-text search:

Most e-books have the function of full-text retrieval or indexing. You can easily find the key points in the book by grasping several important keywords.

2. Personalization:

E-books can provide bookmarks and notes, and can also be personalized according to different reading platforms, such as my favorite, my library ...

3. Instant update:

Because e-books are all digital, they can be updated and modified very quickly, and the latest version of information and related information can be provided at any time.

4. Multimedia presentation:

It can be presented in a multimedia way by combining audio and video, so that books are no longer just read on flat paper, but have more sensory experiences and even entertainment effects.

5. Easy to carry:

E-books can store the original heavy contents of paper books in a small memory, and even dozens of encyclopedias can be carried around and read at any time, which means reading e-books with PDA or special readers.

The characteristics expected by the general public for e-books include: instant reading, version information of title and author, full-text retrieval, my favorites, table of contents, showing the relevant position of the whole book, personal learning, online updating and other functions. ※.

Advantages and disadvantages of e-books.

Advantages:

1. Multimedia presentation

2. Large storage capacity

3. It has the functions of quick retrieval and connection, and is environment-friendly and easy to carry.

Disadvantages:

1. The price is too expensive.

The operation is not easy.

3. It is inconvenient to move

4. Encryption technology and copyright issues

5. Readers accept