The principle of the A9 algorithm is to select products that are more relevant to customer searches from tens of thousands of products in Amazon's wide range of product categories, and display them to customers based on relevance, so that customers can find the corresponding products they need as quickly, accurately and conveniently as possible.

The A9 algorithm focuses on product search and search result sorting, and its ranking factors can be summarized into the following three aspects:

Relevance - meets customer search needs.

Conversion rate - stimulates customer purchasing behavior.

Satisfaction & repurchase rate - brings the ultimate customer experience.