The Internet Archive and Open Library offer more than six million fully accessible public domain e-books. Project Gutenberg has over 52, freely available public domain e-books. An e-reader , also called an e-book reader or e-book device , is a mobile electronic device that is designed primarily for the purpose of reading e-books and digital periodicals.
An e-reader is similar in form, but more limited in purpose than a tablet.
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In comparison to tablets, many e-readers are better than tablets for reading because they are more portable, have better readability in sunlight and have longer battery life. Until late , use of an e-reader was not allowed on airplanes during takeoff and landing by the FAA. Some of the major book retailers and multiple third-party developers offer free and in some third-party cases, premium paid e-reader software applications apps for the Mac and PC computers as well as for Android, Blackberry, iPad, iPhone, Windows Phone and Palm OS devices to allow the reading of e-books and other documents independently of dedicated e-book devices.
Writers and publishers have many formats to choose from when publishing e-books. Each format has advantages and disadvantages. The most popular e-readers  and their natively supported formats are shown below:. Most e-book publishers do not warn their customers about the possible implications of the digital rights management tied to their products.
Generally, they claim that digital rights management is meant to prevent illegal copying of the e-book. However, in many cases, it is also possible that digital rights management will result in the complete denial of access by the purchaser to the e-book. The first major publisher to omit DRM was Tor Books , one of the largest publishers of science fiction and fantasy, in Some e-books are produced simultaneously with the production of a printed format, as described in electronic publishing , though in many instances they may not be put on sale until later. Often, e-books are produced from pre-existing hard-copy books, generally by document scanning , sometimes with the use of robotic book scanners , having the technology to quickly scan books without damaging the original print edition.