An ebook, short for electronic book, is a book publication made available in electronic form, consisting of text, images, or both, that can be read on the flat-panel display of computers or other electronic devices. Ebooks can be read on dedicated e-reader devices, but also on any computer device that features a controllable viewing screen, including desktop computers, laptops, tablets, and smartphones. Unlike other text that can be read on a device, an ebook is not editable, which is for the safety and protection of the author. Ebooks are becoming more popular not only because they are convenient, but also because they are less expensive to produce. Authors eliminate the overhead costs needed for printing hard copies of their work, and because they can be accessed on multiple devices at once, ebooks also take up less space. Ebooks can be created by converting a printers source files to formats optimized for easy downloading and on-screen reading, or they can be drawn from a database or a set of text files that were not created solely for print.