Google uses a weighted form of link popularity called PageRank™. Not all links are created equal. Google differentiates a link from an important site (such as CNN.com) as being better than a link from your nephew's blog. PageRank scoring ranges from 0 to 10, 10 being the best. PageRank scores get exponentially harder to achieve the closer to 10 they are. For example, increasing your own homepage's PageRank from a 2 to 3 is easy with not a lot of additional links, jumping from a 7 to an 8 is very difficult to achieve. The higher the PageRank of the page that's linking to you, the more your site's PageRank will benefit. The better your PageRank, the better you'll do in Google, all else being equal.
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