Inside Google Search". Google Search. Retrieved 11 October 2016. Reverse Image Search Search by Image works Knight, Shawn. "Google updates image search
EP06: How Google Updates Affect your Website’s Page Rank
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An algorithm is just a mathematical formula that’s used by the search engine to determine who will come at the top of the list of searches. Google is constantly changing this algorithm and just recently, we have the Hummingbird update. Find out how these algorithm updates can affect your Google ranking.