Amazon is the unrefuted leader in eCommerce but is slowly encroaching on another industry: advertising. Customers cite Amazon as the No. 1 touchpoint for starting their shopping research. And customers continue to diversify their overall search habits to include multiple digital touchpoints. This report will inspect what kind of search engine Amazon is and how marketers should look to promote their products for discovery on Amazon. This is an update of a previously published report; Forrester reviews and updates it periodically for continued relevance and accuracy; we revised this edition to factor in an important industry development.