BBeB (Broad Band eBook) is the proprietary e-book format developed by Sony and Cannon. BBeB filed include the following extensions: LRF, LRS, LRX. However, in 2010 Sony switched to epub as the default format for their e-book store.
An open e-book standard created by the International Digital Publishing Forum (IDPF). Features reflowable text, inline images, and supports DRM (Digital Rights Management) protected e-books. The latest version is EPUB3 (2011).
A format primarily designed for PDAs and smart phones. Allows access to DRM and non-DRM content. Epub format can also be converted easily into mobi format. In 2012, Amazon stopped using mobi and started using KF8 ("Kindle Fire 8").
PDF, or Portable Document format, was created in the early 90s as a document sharing format. It is best for highly formatted content, images, and has the ability to support DRM (Digital Rights Management) content.
Calibre Ebook Manager and Format Converter
Have an e-book but can't read it on your e-reader?
Calibre is a free e-book format converter. It allows you to organize, re-format, and manage your e-book collection on your computer.
Note: Calibre does not remove DRM protection from e-books.