A writer or publisher has many options when it comes to choosing a format for publication. While the average end-user might arguably simply want to read books, every format has its proponents. The myriad of e-book formats is sometimes referred to as the "Tower of eBabel".
Formats
Formats available include, but are by no means limited to:
Plain text files
Format: text
Published as: .txt
E-books in plain text exist and are very small in size. For example, the Bible, an 800,000-word book, is only about 4 MB.[2] The ASCII standard allows ASCII-only text files (unlike most other file types) to be interchanged and readable on Unix, Macintosh, Microsoft Windows, DOS, and other systems. These differ in their preferred line ending convention and their interpretation of values outside the ASCII range (their character encoding).
Format: Hypertext
Published as: .htm; .html
HTML is the markup language used for most web pages. E-books using HTML can be read using a Web browser. The specifications for the format are available without charge from the W3C.
HTML adds specially marked meta-elements to otherwise plain text encoded using character sets like ASCII or UTF-8. As such, suitably formatted files can be, and sometimes are, generated by hand using a plain text editor or programmer's editor. Many HTML generator applications exist to ease this process and often require less intricate knowledge of the format details involved.
HTML on its own is not a particularly efficient format to store information, requiring more storage space for a given work than many other formats. However, several e-Book formats including the Amazon Kindle, Open eBook, Compressed HM, Mobipocket and EPUB use one HTML file for each book chapter and then Zip compress the files, along with images, metadata and style sheets into one file.
HTML files encompass a wide range of standards and displaying HTML files correctly is extremely complicated[3]. Additionally many of the features supported, such as forms, are not relevant to e-books.
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