EPUB: Electronic Publication

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What is an ePub?

see also Convert a .docx file to EPUB with Calibre

EPUB (electronic publication), sometimes ePub, EPub or epub, are files with the extension .epub. It is also "a free and open e-book standard, by the International Digital Publishing Forum (IDPF)."[1] EPUB supports reflowable, or responsive content, which means that optimisation for particular display devices is built into the design. ePub is meant to function as a single format for use by both publishers and conversion houses, and also for distribution and sale.

Technically, an ePub is just a compressed ZIP file, containing a bunch of XHTML and XML, so it's easy for anyone to make your own with a wide range of tools (including the most basic text editors) and this simplicity built on top of open standards is an attractive solution for the publishing industry to support it.