EPUB is an e-book file format. The term is short
for electronic publication and is sometimes styled ePub. EPUB is supported by many e-readers,
and compatible software is available for most smartphones, tablets, and computers.
EPUB is a technical standard published by the International Digital Publishing Forum (IDPF).
Mobi
A MOBI is an eBook format originally used by
the Mobipocket Reader but now supported by several different readers. It contains an eBook
and may incorporate DRM copyright protection to prevent copying or unauthorized viewing.
MOBI files are supported by various
eReaders, tablets, PDAs, and desktop computer applications.
Azw
Data files also refer to project output files of ebook reader programs, and these data
files may also be used by ebook authoring and editing applications. Amazon developed the AZW
format as the project output files integrated with specifications and standards used by the
Amazon Kindle reader device.