Which groundbreaking e-commerce feature, launched in 1997, fundamentally changed how readers discover books online and became a model for modern recommendation systems?

The publishing industry has undergone dramatic transformation with the rise of digital platforms and e-commerce. Traditional bookstores have had to adapt to new retail omnichannel strategies, while publishers explore innovative ways to reach readers. This trivia question explores a significant milestone in the evolution of book retail that changed how millions of people discover and purchase literature.

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Amazon's 'Customers Who Bought This Item Also Bought' collaborative filtering system
Barnes & Noble's 'Digital First' preview program
Borders' 'PageMatch' customer preference algorithm
Book Depository's 'Global Reader' international recommendation engine