The Trust Rank is a link analysis method described in a paper by Stanford University and Yahoo! The Trust Rank technology of link analysis used for a semi-automatic division useful links from spam. Many of spam pages are created with a single intention - to confuse the search systems. Such pages are basically created for commercial purposes.

They use different technologies to reach an unworthy position in SERP. Though people can easily differentiate spam from useful sites, it is too pricey to verify big amounts of pages. Trust Rank stops this! One of the most popular methods of reaching top positions is an artificial boost of the "importance" of document with help of complex link schemes. For example, Google's Page Rank and other methods of definition of relevant webpage authoritativeness are objects of such manipulations.

The Trust Rank technology selects a small amount of pages verified by a specialist As soon as the quality of these pages is confirmed, the search starts. The robot searches for reliable and quality pages similar to the primary set of trusted documents. Yahoo Trust Rank will be available to the public in the future. Developers of Trust Rank positioned its product as direct competition Google Page Rank.