ePUB is a popular file format used for storing eBooks and other types of content. ePUB, short for electronic publication, was named the official standard of the International Digital Publishing Forum (IDPF) in September 2007.
How do I open ePUB files?
Because of their widespread use, more hardware eReaders support ePUB files than any other eBook file format.
Recommended programs for reading ePUB (other programs are also available):