Formerly, in its baby steps, eBook publishing was simply about digitizing the books to ePub and .mobi. There was actually no consideration at all for interactivity, creativity, hyperlinking or customized rendering.
However, things have changed significantly with the introduction of ePub3 formatting and conversion services done using HTML5. Now texts and graphics and enhanced by incorporating numerous optimal multimedia features. This increases the interactivity of eBook contents thus making it more interesting and adorable to the readers.