In a previous blog post, we explained why PDFs have outlived their usefulness and that you should be using the EPUB format instead. It just makes sense to use a format that gives you a wide variety of accessible and mobile-friendly options by default. But what is EPUB exactly and how does one use it? An EPUB file is a ZIP archive that contains HTML5 files, images, CSS style sheets, and everything used to essentially make a website. It can handle most elements that are associated with modern browsers, which make’s is a great way to share documents in a...