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| 2015 || October || || "In terms of search, we’ve already started to see the impact of AI with Google RankBrain. Announced in October 2015, RankBrain was initially used to try to interpret the 15 percent of searches that Google has never seen before, based on the words or phrases the user has entered."<ref name="20 Years of SEO: A Brief History of Search Engine Optimization"/><ref>{{cite web |title=A Complete Guide to the Google RankBrain Algorithm |url=https://www.searchenginejournal.com/google-algorithm-history/rankbrain/ |website=searchenginejournal.com |accessdate=4 January 2020}}</ref>
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| 2015 || April 21 || || ", and then in 2015 with the Google introduces search engine algorithm update so-called ‘Mobilegeddon’ update that made ‘{{w|Mobilegeddon}}’, which makes website mobile friendliness a ranking signal in searches."<ref name="A brief history of Search Engine Optimization (SEO)"/><ref>{{cite web |title=Finding more mobile-friendly search results |url=https://webmasters.googleblog.com/2015/02/finding-more-mobile-friendly-search.html |website=webmasters.googleblog.com |accessdate=7 January 2020}}</ref>
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| 2015 || || || "According to a 2015 study, the top-ranking factors for search engines and their algorithms (including Google’s core algorithm) are ranked in order of importance as:
