DigiSpider

PageRank (PR) is an algorithm used by Google Search to rank web pages in their search engine results. PageRank was named after Larry Page, one of the founders of Google. ... PageRank works by counting the number and quality of links to a page to determine a rough estimate of how important the website is.
When Google makes an algorithm change they are doing this because they've learned how to provide a better experience for you. They aren't making these changes because they want to screw up your rankings or ruin your business.

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