Amazon’s a9 algorithm is Its ranking algorithm. The algorithm works & takes into account a variety of factors, including product title, product pricing, customer reviews, and sales data. Based on these factors, the Amazon ranking algorithm calculates a ranking for each product. This ranking is then used to determine which products are displayed first in search results. Amazon’s ranking algorithm regularly updates the A9 algorithm to keep its search results up-to-date and relevant. As a result, the Amazon search algorithm is constantly evolving, making it one of the most complex and effective ranking algorithms in use today.