An e-reader, also called an e-book reader or e-book device, is a mobile electronic device that is designed primarily for the purpose of reading digital e-books and periodicals.
This kind of application lets you download and view electronic books and publications on your desktop or laptop computer, as well as on your smartphone. The app contains controls for making notations within e-books and publications and a built-in navigation system for turning the e-book or digital publication's pages.
The very first e-reader is The Tale of Rocketbook which was invented by Martin Eberhard and Marc Tarpenning in 1997. Since then, It has become a digital device for people who like reading books everytime and everywhere.
So go and try it at a electrical store if you can.