This is a book that can be downloaded and read on a computer. Most e-books are saved in Adobe Acrobat and require Adobe Acrobat reader (a free program) to be accessed. E-books (sometimes spelled ebooks) are quickly becoming the newest way to receive information online. There are many free e-books available on the web, and there are also e-books available for purchase. When you purchase an e-book, you can download it directly to your computer.