Which e-commerce innovation revolutionized the book industry in 2007, creating a new digital reading ecosystem and dramatically changing how authors could publish their work?

The publishing industry has undergone massive changes with the rise of e-commerce platforms. Traditional bookstores have adapted or disappeared, while digital marketplaces have fundamentally changed how readers discover and purchase literature. This trivia question explores a pivotal moment in the evolution of online book retail that reshaped the entire literary marketplace and reading habits worldwide.

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Amazon's Kindle and Kindle Direct Publishing platform
Barnes & Noble's Nook Store and Press platform
Apple's iBooks and iBooks Author program
Google's Play Books and Partner Center