: The "brain" of the book, containing metadata (title, author), a list of all files, and the reading order.
The fastest way to create an EPUB is to export it directly from common writing software. This works best for simple, text-heavy layouts. EPUB 3.3 - W3C 6833 epub
An EPUB is essentially a renamed .zip archive containing a specific collection of web-based files: : The "brain" of the book, containing metadata
: An XHTML file used by e-readers to generate a machine-readable table of contents. EPUB 3
: A single-line file ( application/epub+zip ) that must be the first, uncompressed file in the archive.
EPUB is the industry-standard, open-source format used for most modern ebooks. While simple text documents can be converted easily, professional-grade EPUBs require specific structural elements to ensure readability across all devices. Core Structure of an EPUB File