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well for particular searches, the engines have learned that they cannot always rely on websites to be honest about their importance. Thus, the days when artificially stuffed meta tags and keyword rich pages dominated search results have been replaced and given way to search engines that measure trust via links and in particularly content.

The theory goes that if hundreds or thousands of other websites link to you, your site must be popular, and thus, have value. If such links come from very popular and important and at the very same time trustworthy websites, their power is multiplied to even greater degrees. Links from sites like .gov sites or .edu sites and others carry with them inherent trust that search engines then use to increase your ranking position. If, on the other hand, the links that point to you are from low-quality, interlinked sites or automated garbage domains which also known as link farms, the search engines have a systematic function in place to decrease the measured value of such links.

4. Understanding PageRank
The most well-known system for ranking sites based on link data is the simplistic formula developed by Google's founders which is the commonly known PageRank. PageRank, which relies on log-based calculations, is described by Google in their technology section:

PageRank basically relies on the uniquely democratic nature of the web by using its vast link structure as an indicator of an individual page's value. In essence, Google interprets a link from page A to page B as a vote, by page A, for page B. But, Google looks at more than the sheer volume of votes, or links a page receives; it also analyzes the page that casts the vote. Votes cast by pages that are themselves "important" weigh more heavily and help to make other pages "important."

PageRank is derived in my understanding, by amalgamating (add up or merge) all the links that point to a particular page, increasing the value of the PageRank that they pass which is ultimately based on their own PageRank and applying the systematic calculations into the formula.

PageRank, in essence, measures the brute link force of a site that is based on every other link that points to it without significant regard for quality, relevance or trust. Essentially, in the current era of SEO, the PageRank measurement in a typical Google's toolbar, directory or through sites that query the service is of a very substantial and yet limited value. Pages with PR7 (PageRank level 7) can be found ranked 20-30

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