Kindle Unlimited is a kind of Netflix for Amazon's digital e-books, the so-called Kindle books.
Before You Try Kindle Unlimited… WATCH THIS | Amazon Kindle Unlimited review 2021
You pay a monthly subscription fee for access to the entire Kindle Unlimited library, where you can read and enjoy as many Kindle books as you want. That's exactly why it's called "Unlimited."
Book publishers can choose to include their books in Kindle Unlimited when they list them on Amazon. There are over a million book titles, thousands of audiobooks, and popular magazines included in the Kindle Unlimited library.
Just as you don’t own the movies you watch on Netflix or the songs you listen to on Spotify, you don’t own the books you read on Kindle Unlimited. You essentially borrow them until you finish reading them and decide to delete them from your account, or until you decide to cancel your Kindle Unlimited subscription.