An eBook is an electronic document. In modern terminology, we could define it as the electronic or digital version of a traditional printed book. Ebooks consist of text, images or both. It is often referred to the devices used to read these books, which is also known as an e-reader or eReader, like Kindle or Nook. Ebooks can be read using the computer, tablets or any mobile device. The market for e-book readers offers users a large number of reading devices from different manufacturers. Therefore, there is no standard format for digital books that is supported by all reading devices.
The publisher of an electronic book intends to reach as many readers as possible. Reading an eBook without problems on their devices depends on the file format chosen by the author.
Simply put, an ebook is what you’re reading on a screen of any type.