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E Book from WikiPedia:

An e-book (short for electronic book, also written eBook or ebook), as known as a digital book, is an e-text that forms the digital media equivalent of a conventional printed book, sometimes protected with a digital rights management system. E-books are usually read on personal computers or smart phones, or on dedicated hardware devices known as e-Readers or e-book devices. Many mobile phones can also be used to read e-books.

Early e-books were generally written for specialty areas and a limited audience, meant to be read only by small and devoted interest groups. The scope of the subject matter of these e-books included technical manuals for hardware, manufacturing techniques, and other subjects.

Numerous e-book formats emerged and proliferated, some supported by major software companies such as Adobe's PDF format, and others supported by independent and open-source programmers.

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