What is an epub file and how do I open an epub file?

The .epub file extension was developed by IDPF and it is mostly used by e-book files. In other words, e-books are saved in this file format. This is the file extension that allows data and information contained in the e-book to be read and distributed by users. It comes in a zip format and this is what makes e-books easily distributed by publishers. This .epub file extension is also known as an open e-book file because it refers to three IDPF standards. These standards are the Open Publication Structure, the Open Packaging Format and the Open Container Format. This is because the content of the e-book is not the only thing that’s saved in .epub file format. The structure of the e-book and everything about the e-book are all in .epub format.  The fact that users can read e-books and other digital publications is owing to the .epub file extension. This file extension is also what makes it easy for other devices to access and read e-books; devices such as e-book readers, cell phones, ipads, etc.

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