Definition:
EPUB is an abbreviation of the term “electronic publication”. EPUB is a free and open-source ebook publishing platform that is used by many vendors for ebooks. An EPUB book will be a zipped file with the extension .epub and a very specific file structure.
EPUB content is written in XML and XHTML. And you can learn more about the EPUB format and how to write ebooks using EPUB in the EPUB section of this site.
Alternate Spellings: ePub, EPub, and epub are all common spellings, but the original EPUB vendor prefers all capital letters.
