Hilltop algorithm
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The Hilltop algorithm is a patented algorithm created by Krishna Bharat and George A. Mihailafor of the University of Toronto. The algorithm is used to find topic relevant documents to the particular keyword topic searched in Google search and lifting the PageRank of the documents linked in them in the search results page.
Google acquired the algorithm in February 2003 but it took a lot time for Google to test it as it was a major change in the Google search function.