The digital age has fundamentally transformed how we consume literature. No longer tethered to physical bookshelves, readers worldwide have embraced the flexibility, portability, and accessibility of electronic books. At the heart of this revolution lies a single, standardized file format: .

: The design remains exact and frozen, mapping perfectly to a traditional page design. This is essential for children's books, complex textbooks, and manga or comic arts. Technical Pillars of the EPUB Standard