The advantage of e-book

I would like to share here the advantage of e book:
E-BOOK.
An e-book is an electronic (or digital) version of book. It is also a book you can download via the internet. It comes as an .exe file which means that it runs as a program in its own right. The e-book can be accessed any time and read off the screen or it can be printed out and kept as hard copy. It contains links to useful websites. If you are reading it whilst online these links will be live. With a single mouse click you can jump to the contents page which provides you with a broad overview of the books subject matter. One more click will take you straight to the section of your choice. The e-book also contains a powerful search engine which means that you can instantly access any section of the book just by remembering a single word or phrase from it.
(http:www.e-bookswriter.com/create_ebook_000048.htm)


THE ADVANTAGES OF E-BOOK.
Text can be searched, except when represented in the form of images.
Take up little space.
Hundreds ( or thousands) may be carried together on one device.
Approximately 500 average e-books can be stored on one CD (equivalent to several shelves’ worth of print books)
Because they take up little space, eBooks can be offered indefinitely, with no ’out of print’ date, allowing authors to continue to earn royalties indefinitely (copyright law permitting),and allowing readers to find older works by favorite authors.
E-books may read in low light or even total darkness, with a back-lit device.
Type size and type face may be adjusted. However, enlarging e.g. a PDF document magnifies the text but preserves the original layout and spacing; a practical limit on zooming follows from the requirement to keep a text column within the width of the screen (otherwise horizontal scrolling would be needed during and after reading each line, which would be very cumbersome). However, tagged PDFs can be reflowed in Acrobat 6 and 7, eliminating the horizontal-scrolling problem in zoomed PDFs. For more on zooming in, see Electronic maps.
Can be used with text-to-speech software.
Readily reformatted for independent platforms.
Instantly copied
When a back up is kept in a remote place, cannot be lost by fire, etc.
Once distributed, elimination is hard to impossible.
Distributed at low cost.
Distributed instantly, allowing readers to begin reading at once, without the need to visit a bookstore.
Simultaneously share book (if networked).

Errors may be easily corrected with downloadable lists of errata or simply with corrected text. (This can also be an advantage for printed books, in different circumstances.)
At the moment, ebooks are commonly published by independent publishing houses, which can mean greater editorial and authorial freedom and more room for experimentation.
An inexpensive format for works that require color.
An excellent choice of format for works that benefit from search and cross-reference capabilities, such as dictionaries, reference works, certain kinds of textbooks.