While most search engines use the content of webpages as one factor in determining if a site is relevant to a search request, a more important factor to many search engines is the content and number of pages that link to it.
Search engines strive for relevancy. To do this, they have to review the content of a website and evaluate the people who are linking to it. Linking back helps to contribute to increasing the quality of your content and your relevance in the major search engines.
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