An electronic book (also e-book, eBook, digital book) is a text and image-based, book-length publication in digital form designed to be read on computers or other digital devices.
other mobile or pocket-sized computing devices that typically have a display screen with touch input or a miniature keyboard include:
App is an abbreviation for "application" (i.e., software application).
It commonly refers to a small, specialized program that can be downloaded and run on your computer or mobile devices (smartphones, tablets, etc.)
An eBook reader, also called an e-book device or eReader, is a handheld or mobile electronic device that is designed especially for the purpose of reading eBooks and periodicals.
Examples of popular eReaders include:
eBooks have two different types of format:
file format and DRM format
A file format is the way that information is encoded for storage in a computer file. There are two main categories of file format: proprietary and open.
Proprietary eBook file formats are designed by eReader manufacturers to be unique to that manufacturer's eReader (e.g., Amazon Kindle).
Open, or general, file formats, such as EPUB, PDF, TXT are designed so that most eReaders can view them.
Common file formats:
Format File Extension
Microsoft Reader .lit
MobiPocket .prc. .mobi
Plain Text .txt
Digital Rights Managment(DRM) is "access control technology" that companies (hardware manufacturers, publishers, copyright holders) put on eBooks and other digital products to limit the use of digital content and devices after sale.
DRM acts as a lock on eBooks to prevent buyers from copying them, passing them on for free, or reading them on a competitor's eReader.
For more information: