When determining search results ranks, one of the primary factors search engines take into account is the amount of “link juice” a site has. Link juice refers to the amount and quality of other web sites that link to a place on the web.
Link building is a great way to gain online traffic and reputation. To increase this factor, and thus their rankings, many sites have gone through link building strategies.
To link build, you need to get other sites to link to yours. A common way to do this is to contact the owner of another web site and ask for him to link to your site. In exchange, many people offer to link back in reciprocation, a kind of “you scratch my back, I’ll scratch yours” approach.
Another common strategy is to post in response to blogs and forums, and put a link to your site there.
The most desirable links are from popular, reputable sites that have content that compliments yours in some way.
It’s important to notice that aggressive link building strategies, especially those that get spam-like, will be detected and penalized by advanced search engines over time. A more moderate approach is usually best.
Of course, the best way to generate interest and links is having an interesting site full of useful content to begin with, rather than relying on complex schemes.
http://www.google.com/support/forum/p/Webmasters/thread?tid=39ad174d2c0f6fd1&hl=en
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