It is a file format used in EPUB (Electronic Publication) ebooks to define the structure and navigation of the content. Essentially, it acts as a table of contents and map for the ebook, allowing readers to easily navigate between chapters, sections, and other parts of the book.
Here's what NCX files do:
* Organize content: They define the hierarchical structure of the ebook, grouping chapters, sections, and other elements.
* Create navigation menus: The NCX file provides the information needed to generate the table of contents and other navigation menus within the ebook reader.
* Enable bookmarking: NCX files allow readers to bookmark specific locations in the book.
* Support navigation features: They enable features like going to the next or previous chapter, searching for specific keywords, and navigating to specific sections.
In essence, the NCX file ensures that the ebook is well-organized and that readers can easily find their way around it.