This document discusses electronic books (e-books) and e-book readers. It defines an e-book as a digital version of a printed book that can be read on computers or other electronic devices. It describes how e-book readers are specialized devices designed for reading e-books and digital publications. E-book readers allow users to bookmark pages, make notes, highlight text, and adjust font sizes similarly to printed books. The document also provides examples of how e-books can be used for educational purposes and in the classroom.