An electronic book (variously, e-book, ebook, digital book, or even e-edition) is a book-length publication in digital form, consisting of text, images, or both, and produced on, published through, and readable on computers or other electronic devices. Sometimes the equivalent of a conventional printed book, e-books can also be born digital. The Oxford Dictionary of English defines the e-book as "an electronic version of a printed book," but e-books can and do exist without any printed equivalent. E-books are usually read on dedicated e-book readers or general purpose computer tablets. Personal computers and many mobile phones (most smart phones) can also be used to read e-books
Numerous e-book formats emerged and proliferated, some supported by major software companies such as Adobe with its PDF format, and others supported by independent and open-source programmers. Multiple readers followed multiple formats, most of them specializing in only one format, and thereby fragmenting the e-book market even more. Due to exclusiveness and limited readerships of e-books, the fractured market of independent publishers and specialty authors lacked consensus regarding a standard for packaging and selling e-books.
However, in the late 1990s a consortium was formed to develop the Open eBook format as a way for authors and publishers to provide a single source document that could be handled by many book-reading software and hardware platforms. Open eBook defined required subsets of XHTL and CSS; a set of multimedia formats (others could be used, but there must also be a fallback in one of the required formats); and an XML schema for a "manifest", to list the components of a given ebook, identify a table of contents, cover art, and so on. Google Books has converted many public-domain works to this open format.
E-book formats
In 2010 e-books continued to gain in their own underground markets. Many e-book publishers began distributing books that were in the public domain. At the same time, authors with books that were not accepted by publishers offered their works online so they could be seen by others. Unofficial (and occasionally unauthorized) catalogs of books became available over the web, and sites devoted to e-books began disseminating information about e-books to the public.
Dedicated hardware readers
There have been several generations of dedicated hardware e-book readers. The Rocket eBook and several others were introduced around 1998, but did not gain widespread acceptance.
As of 2009[update], new marketing models for e-books were being developed and a new generation of reading hardware was produced. E-books (as opposed to ebook readers) have yet to achieve global distribution. In the United States, as of September 2009, the Amazon Kindle model and Sony's PRS-500 were the dominant e-reading devices. By March 2010, some reported that the Barnes & Noble Nook may be selling more units than the Kindle in the US.
On January 27, 2010 Apple Inc. launched a multi-function device called the iPad and announced agreements with five of the six largest publishers that would allow Apple to distribute e-books. The iPad includes a built-in app for e-books called iBooks and the iBooks Store.
In July 2010, online bookseller Amazon.com reported sales of ebooks for its proprietary Kindle outnumbered sales of hardcover books for the first time ever during the second quarter of 2010, saying it sold 140 e-books for every 100 hardcover books, including hardcovers for which there was no digital edition. By January 2011, ebook sales at Amazon had surpassed its paperback sales. In the overall US market, paperback book sales are still much larger than either hardcover or e-book; the American Publishing Association estimated e-books represented 8.5% of sales as of mid-2010, up from 3% a year before. In Canada, The Sentimentalists won the prestigious national Giller Prize. Owing to the small scale of the novel's independent publisher, the book was initially not widely available in printed form, but the ebook edition became the top-selling title for Kobo devices in 2010.
A comparison of available e-book readers can be found at comparison of e-book readers
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