Which groundbreaking e-commerce innovation first allowed self-published authors to directly upload and sell their books to readers, disrupting traditional publishing in the 2000s?

The publishing industry has undergone dramatic transformations with the rise of e-commerce. From traditional bookstores to online giants, the way readers discover and purchase literature has been revolutionized. This trivia question explores a significant milestone in literary e-commerce history that changed how publishers, authors, and readers interact in the digital marketplace. Test your knowledge about the business side of the literary world!

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Amazon Kindle Direct Publishing (KDP)
Google Books Partner Program
Apple's iBooks Author
Barnes & Noble's PubIt! (later NOOK Press)