EPUB is, without any doubts, my preferred ebook format. I knew it was an open format standard, but I have never taken a look at what&#x27;s under its hood. After I took a look at this presentation, I&#x27;m going to dedicate this evening to exploring the format, its advantages and its disadvantages.<p>Unfortunately, I am not able to find any reasonably good looking Linux client for it, so I usually use ebook-convert command that comes with Calibre to convert my books from PDF to EPUB and vice versa.