An e-reader is a hardware device used to read e-books. An e-Reader is a device category similar to laptop, netbook, notebook, and desktop computer. It is also a light-weight hardware device used to read e-books, or books not in print (written down).
its a device that you can wirelessly download "e-books" which then the entire book can be read on the device. It uses a new technology that does not use a lot of battery power so reading a book will not kill the batter.
Electronic readers are small, computerized tablets with a visible LCD touch screen specifically designed for you to read books, magazines, and other written forms of communication. Examples of electronic readers include the Amazon Kindle and the Barnes and Noble Nook. Tablets like the iPad can also be transformed into electronic readers. These electronic readers have special functions, such as optimized lighting and touch-sensitive turn paging and underlining, designed for an enhanced reading experience.