First released in 2007, EPUB, the main advantage with Epub over PDFs or other document formats is its ability to quickly and automatically adjust text for different screen sizes (one can publish content in a fixed layout also). It lets users change the font and text size themselves, and can accept GIF, JPEG PNG and SVG images.However, Amazon’s e-ink Kindle still doesn’t support the format directly, though it is easy to convert. Other ereader brands, such as Kobo, support EPUB, as do most smartphones, tablets, and computers.
While it will work with any Google Doc file, it’s designed more for longer-form content, perhaps a company report, academic paper, or — of course — a book.
Source: Venturebeat, The nextweb