Originally Posted by Zarich
You seem to not fully understand the difference between hardware and software. Epub is software. Not hardware. Amazons version is also software. Amazons book software can be coded to do anything epub can do.. without a committee even. This is not a hardware thing unlike HD-DVD vs bluray which are two completely different hardware technologies.
I think he means that the epub format specification is more sophisticated than the older mobi format that much of amazon's books are based on. Both formats are essential html documents but mobi doesn't properly support some html tags or complex structures.
For example, both Microsoft Word and Notepad are software but you can create better looking and more complex documents with the former.