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Webmaster all know that the link is important! Link is this phase of the search engine to measure the value of a site important standards, so the link is the webmaster need to spend the mind of the place!
The most direct role of the link is to Google's PR has helped, can be said to be the most direct impact (or to your ranking played a big factor). If your site PR value is 0, when there is a PR value of 5.6 of a site to you to do the link, then your PR value has a great probability of 3 (that is afraid of your entire site outside the link only such a chain)! This is the PR of the special delivery, like real life, A very close friend of yours has a tens of millions of, then he can help you a = have hundreds of thousands of, this is very easy thing, is a kind of value transfer!
However, PR is just a website quality logo, not a good site's only standard, we all know a lot of spam sites their PR value is very high! But they are not a good website! So you don't have to put all the mind to spend on the pursuit of PR value above, and not focus on the development of the content of the site ! In that case, your site is at best a link tool, and not many people will go to your site for the second time!