In April 2005, the Open eBook Forum became the International Digital
Publishing Forum (IDPF), and the OeB format was replaced with the ePub
format (ePub standing for "electronic publication") as a global
standard for ebooks. More and more digital books are in ePub format,
widely used by publishers to distribute their ebooks, because it is
designed for reflowable content, meaning that the text display can be
optimized for the particular display device used by the reader:
computer with a large screen, ebook reader with a medium screen, and
smartphone with a small screen. The format is meant to function as a
single format that publishers and conversion houses can use in-house,
as well as for distribution and sale. The PDF files created with recent
versions of Adobe Acrobat are compatible with the ePub format.