How many Versions of EPUB are in use and why?

Prof.(Dr.) D G Mahto, Founder & CEO -
The primary versions of EPUB are EPUB 2 and EPUB 3. EPUB 2 is an older version that is less flexible than EPUB 3. EPUB 3 is the latest version, offering more features and support for advanced layouts and interactive elements. 
Here's a more detailed breakdown:
EPUB 2:
  • Developed by the International Digital Publishing Forum (IDPF).
  • Replaced the older Open eBook (OEB) standard.
  • Offers limited text and image formatting controls.
  • Some publishers still use EPUB 2 files, but it's gradually becoming obsolete. 
EPUB 3:
  • A successor to EPUB 2, offering more features and flexibility.
  • Supports HTML, CSS, and SVG for layout and typography.
  • Includes support for video, audio, and interactive features.
  • Is the current version of EPUB, according to the W3C. 
EPUB 3.x (subversions):
  • EPUB 3.0: Approved in 2011. 
  • EPUB 3.0.1: A minor update to EPUB 3.0, approved in 2014. 
  • EPUB 3.1: Introduced in 2014, but faced some compatibility issues and didn't gain wide adoption. 
  • EPUB 3.2: A more recent version, aiming for backward compatibility with EPUB 3.0.1 while retaining many of the changes from 3.1, according to the W3C. 
  • EPUB 3.3: The latest version, with ongoing development by the W3C EPUB 3 Working Group. 
In essence: While EPUB 2 is still used, EPUB 3 is the current standard and offers a wider range of features and flexibility for digital publishing, according to Adobe. 
Prof. (Dr.) D. G. Mahto: A Visionary Director, Professor, Leader & Educator With over 25 years of excellence, Prof. (Dr.) D. G. Mahto is a Director, Professor, Philanthropist, HEI Builder, writer, consultant, reviewer, and career advisor at "Career Education for Success—Discover, Apply, Succeed!" He has empowered individuals, brands, and institutions through insightful content, innovation, and mentorship. Holding a Ph.D. in Engineering from NIT Jamshedpur, he has pursued Post-Doctoral Programs at IITs, NITs, and IIITs, reinforcing his expertise. A member of prestigious global organizations like NPA (USA), IET (UK), ASME, IAENG, and MRSI, he actively contributes to engineering, research, and education. An accomplished writer and researcher, he shares knowledge via Career Education Success Now, Career Edus, and Discover Knowledge Wisely. His vision integrates technology, innovation, and leadership, bridging gaps between aspirations and achievements. Connect with him for insights into education, research, and professional growth.

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