According to the carrier, it can be divided into printing type, miniature type, machine-readable type and audio-visual type.

Among them, computer reading: it is the latest carrier form. Mainly through coding and programming, files are converted into symbols and machine language, input into computers, stored on magnetic tapes or disks, and then output by computers when reading. It can store a large amount of information, organize it in any form, and extract the required information from it at a very fast speed. E-books that have appeared in recent years belong to this type.

Features of e-books:

E-books and traditional books have many common characteristics: they contain a certain amount of information, such as a certain number of words and colorful pages; According to the format of traditional books, to adapt to readers' reading habits; Send information through reading and so on.

However, as a new form of books, e-books have many characteristics different from or not possessed by traditional books: they must be read by computer equipment and displayed on the screen; It has the advantages of combining graphics, text, audio and video; Recyclable; Reproducible; It has a high cost performance; Have greater information content; There are more diverse distribution channels and so on.