+A9.com was an [Amazon](/wiki/Amazon) subsidiary, a silent engine of innovation focused on search and advertising technology. Its work fueled core e-commerce experiences and advanced [Information Retrieval](/wiki/Information_Retrieval) systems for the global retailer.
+## See also
+- [Search](/wiki/Search)
+- [Advertising](/wiki/Advertising)
+- [Amazon](/wiki/Amazon)
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