An EPUB is technically a zipped archive containing a specific set of folders and files.
You can develop an EPUB using various methods depending on your technical comfort: EPUB 3.3 - W3C V epub
: A simple file identifying the archive as an EPUB. An EPUB is technically a zipped archive containing
: Often an NCX file (EPUB 2) or XHTML (EPUB 3) that provides the clickable Table of Contents. 2. Tools for Creating EPUBs Style Sheets : CSS files that define the layout
: Contains container.xml , which tells the reading system where to find the main content metadata. OEBPS/Document Folder : The core directory containing: Content Documents : XHTML or HTML files for the text. Style Sheets : CSS files that define the layout.
: An XML file that lists all resources (manifest) and defines the reading order (spine).