eBook - ePUB 2.0
ePublisher can deliver content to your mobile users and eReader platforms with the IDPF ePUB 2.0 eBook standard. This format makes sense for long form content or reference materials which are not suitable for web delivery. eBooks enable users to access content offline, track their reading progress, and otherwise enjoy the benefits of traditional press books.
Consider using this format when delivering content to eReader devices, such as the Apple iPad.