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content of the documents returned in a search matched the Internet user's query intention and terms. The relevance of a document ultimately increases if the terms or phrase queried by the user occurs multiple times and shows up in the title of the work or in featured or important headlines, sub-headers or tags.

Popularity - the relative importance, measured via citation (the act of one work referencing another, as often occurs in academic and business documents) of a given content that matches the user's query. The popularity of a given document consequently increases with every other document with the relevant contents that references it.

Relevances and popularity were then evolved to web search 40 years later and manifested themselves in the form of document or content analysis and link analysis.

2. Understanding Document and link analysis

In document analysis, search engines compared and sieve for whether the search terms are found in important areas of the document - the title, the meta data, the heading tags and the content body. They set out to automatically measure the level of quality of the contents in the document.

In link analysis, search engines measure not only the links to the site, but also the description about this site. They also have a good comprehension on what is affiliated with what with the help of historical link data, the registration records of the site and other sources, who is worthy of being trusted like .edu and .gov pages are generally more valuable for this reason and contextual content data about the site the page is hosted on and which is the site that links to that site and what they had said about that site in terms of description.

Link and document analysis worked together and overlap hundreds of factors that can be individually measured and filtered via the search engine's algorithms, a set of instructions that tell the engines what importance to each assigned factor. The algorithm will the one that ultimately determines scoring for the documents and will subsequently links results in decreasing order of importance that forms a structured rankings.

3. What are the Information Search Engines can Trust

As search engines index the web's link structure and page contents, they find two different but distinctive kinds of information about a web site or page like the attributes of the page or site itself and descriptions that can be found from other pages. Since the web is such a commercial place, with so many parties interested in ranking

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