eBook is the process of creating a ePub/ Kindle file that can be read using eReader in the tablets. The famous tablets are iPad, Mini iPad, Kindle Fire, Kindle Paperwhite, B&N Nook, Kobo, Sony and other Android tablets.

eBooks can be created from Microsoft Word documents, InDesign, Quark or Print PDF or even from the paperback.

ePub3:-
ePub is widely accepted eBook format and supported by a wide range of eReaders like iPad, Sony, Kobo, B&N Nook, and Android tablets. ePub allows the use of a variety of fonts, styles and advanced layouts. The International Digital Publishing Forum (IDPF) conducts ePub standards and trade activities. The ePub3 is the current version of the ePub standard.

MOBI:-
A file with the MOBI file extension is a Mobipocket eBook file. Amazon Kindle readers require eBooks in MOBI format. Preview of the final eBook in this format can be seen on the Kindle app or Kindle eReader before they are submitted to Amazon for sale. Kindle supports color, graphics, images, etc., but has limitations in terms of font styles and layout. Aside from the Kindle Fire, all other Kindle devices only display in grayscale.

Fixed-Layout eBook:-
Fixed-layout eBooks are commonly used for books with heavy graphics, tables, and other formatting. Children’s picture books, business books, and text books are some examples of fixed-layout eBooks. A fixed-layout eBook can look exactly like your original printed book. Kindle Fire, Apple, B&N Nook and Kobo supports fixed-layout files.

iBook Author:-
iBooks Author is an amazing app that allows anyone to create beautiful Multi-Touch textbooks — and just about any other kind of book — for iPad. With galleries, video, interactive diagrams, 3D objects, mathematical expressions and more, these books bring content to life in ways the printed page never could.

ePDF:-
Encapsulated Portable Document Format (ePDF) files work with most e-Readers / PC’s and ot ensures a smooth reading experience when compared to PDF’s.

Here is the article link about our company which has been published recently in Publishers weekly. http://www.scribd.com/doc/223164990/Digital-Solutions-in-India-May-2014#page=10