Which product launch in 2007 revolutionized the book retail industry by making e-books mainstream and eventually capturing over 80% of the US e-book market?

The book retail landscape has transformed dramatically over the decades. Major bookstore chains have risen and fallen, while independent bookstores have experienced both decline and renaissance. This poll tests your knowledge about one of the most significant product launches in literary retail history that changed how millions access literature.

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Amazon Kindle
Apple iBooks
Barnes & Noble Nook
Sony Reader