There are free Kindle readers for most devices. If you do not want to install a Kindle reader, you can read your Kindle book online in your web browser.

Web Browser Online

After you purchase a Kindle book from Amazon, the book shows up automatically in your Amazon account. Go here to see all your Kindle books and read them in your web browser.

https://read.amazon.com

Android, Apple iOS, iPad, iPhone, Mac and Windows PC

Install the Kindle reader for your device from here.

https://www.amazon.com/kindle-dbs/fd/kcp

Samsung

Here is the Kindle reader just for Samsung.

https://www.amazon.com/gp/digital/kfs-landing-page

Kindle Readers

Here is a list of Kindle readers.

https://www.amazon.com/gp/help/customer/display.html?nodeId=200783640