* Amazon Kindle Store is an e-book store that sells over one million e-books. You can read e-books on a Kindle e-reader or on the Kindle app for smartphones and tablets.
* Barnes & Noble Nook Store is an e-book store that sells over one million e-books. You can read e-books on a Nook e-reader or on the Nook app for smartphones and tablets.
* Apple Books Store is an e-book store that sells over one million e-books. You can read e-books on an iPhone, iPad, or Mac.
* Google Play Books is an e-book store that sells over one million e-books. You can read e-books on an Android device or on a computer.