Electronic publishing (also referred to as e-publishing or digital publishing or online publishing) includes the digital publication of e-books, digital magazines, and the development of digital libraries and catalogues. It also includes an editorial aspect, that consists of editing books, journals or magazines that are mostly destined to be read on a screen (computer, e-reader, tablet, smartphone) Electronic publishing has become common in scientific publishing where it has been argued that peer-reviewed scientific journals are in the process of being replaced by electronic publishing. It is also becoming common to distribute books, magazines, and newspapers to consumers through tablet reading devices, a market that is growing by millions each year,[2] generated by online vendors such as Apple's iTunes bookstore, Amazon's bookstore for Kindle, and books in the Google Play Bookstore. Market research suggests that half of all magazine and newspaper circulation will be via digital delivery by the end of 2015[3] and that half of all reading in the United States will be done without paper by 2015.Although distribution via the Internet (also known as online publishing or web publishing when in the form of a website) is nowadays strongly associated with electronic publishing, there are many non-network electronic publications such as encyclopedias on CD and DVD, as well as technical and reference publications relied on by mobile users and others without reliable and high speed access to a network. Electronic publishing is also being used in the field of test-preparation in developed as well as in developing economies for student education (thus partly replacing conventional books) – for it enables content and analytics combined – for the benefit of students. The use of electronic publishing for textbooks may become more prevalent with Apple Books from Apple Inc. and Apple's negotiation with the three largest textbook suppliers in the U.S.