If you’re confused by the world of digital books and eReaders, here’s a quick tutorial to get you up to speed: An “eBook reader,” also called an eBook device or eReader, is an electronic device that is designed primarily for the purpose of reading books and periodicals in a digital format, rather than flipping the paper pages of a book, newspaper or magazine. The most popular eReaders are Amazon’s Kindle and Barnes and Noble’s NOOK. Some smart phones such as the iPhone and Droid can also function as an eReader, as can your computer, whether that’s a PC or a Mac.