An e-book reader is a portable electronic device for reading digital books and periodicals, better known as e-books. The e-book reader is normally designed to operate over long hours by consuming minimal power. Most e-book readers rely on the e-ink technology for their displays.
E-ink displays closely mimic the appearance of paper on ink and are less strenuous to the eyes than most LCD or LED displays. They are also practically glare-free and allow the device to be used even under direct sunlight.