 It is an indicator of how well the search result met the query intent of the user, and is used as a feedback mechanism to improve search results.Another example of this is the Surf Canyon browser extension, which advances search results from later pages of the result set based on both user interaction (clicking an icon) and time spent viewing the page linked to in a search result.Pseudo relevance feedback, also known as blind relevance feedback, provides a method for automatic local analysis.