A9 Product Search processes billions of queries for hundreds of millions of products on Amazon sites worldwide. Whenever a customer types in a query or browses through product categories, our service goes to work.

Our expertise is product search. We sort and rank structured and semi-structured data at an unprecedented scale. Our high-availability, low-latency service delivers:

• a powerful query language with precise matching control
  
• relevance based on leading-edge information retrieval
  
• ranking algorithms that learn from customer behavior
  
• sophisticated variation elimination
  
• real-time tracking and managing of millions of product and inventory changes every day.
  

We are a highly customer-centric organization, incorporating customer feedback into all aspects of our service. In turn, A9 Product Search makes it easy for searchers to find what they want by providing:

• advanced sorting options that put the user in control
  
• attribute-based navigation to support faceted meta-data
  
• the ability to find a book from a single quote
  
• an international and localized service.
  

A9.com powers the search behind Amazon's ground-breaking Search Inside The Book service.

Our technology lets users find the exact book they want, even if all they can remember is a character name, a sentence they can't place, or an obscure phrase they can't forget.