Answer: An e-book or electronic book is a digital form of a book that is accessible and can be read using computers or comparable electronic devices, such as an e-book reader, tablet or smart phone. E-books are published in various formats, such as portable document format (PDF) or EPUB; various publishers and vendors support any of several different formats. E-books are typically capable of being searched, making them excellent reference sources. E-books are accessible 24 hours a day, 7 days a week. Many vendor platforms and e-book reading devices provide amenities such as dictionary and note taking applications.