Google's search engine algorithm is called PageRank. Google's more sophisticated parts of Google Search ranking are not disclosed. Still, Google's 2004 paper that first laid out Google PageRank had three main points: (1) Pages that link to other pages rise in the rankings by each link they generate; (2) A page with lots of links to it probably so-called "important"; and (3) Page rank changes over time as Google continuously crawls and interprets more links.