An open eBook standard created by the International Digital Publishing Forum (IDPF). Notable features of this file format are reflowable text, inline images, and the support of DRM (Digital Rights Management) protected eBooks. Two sources of EPUB eBooks are EBSCO eBooks and Overdrive. EPUB eBooks can be read on the Nook, iPad and Android tablets.
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.