Amazon Kindle

Amazon Kindle is an ebook store and the reading device ecosystem built around it, with apps on phones, tablets and desktop alongside the dedicated readers.

Its catalogue is the largest in English publishing, and sync across devices means a book continues where you left it regardless of what you read it on.

Books are tied to the account through digital rights management, so a purchased title lives inside the ecosystem rather than as a file you own outright — the practical constraint worth understanding before building a large library.