How to build Back link?

There are many way to build back link i.e Article Submission, Directory Submission, Social bookmarking, Blog comment, Forum Posting and you need to update your blog site with relevant unique content please ember quality content also build back link itself. The above said method are time consumes but very effective for SEO the said method not only give you only back link and high page rank it will also improve your keywords popularity please do not forget to anchor text your keyword during link building camping
References :
http://www.submit20.com

Best,
Chris.
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For example if you have a backward link from a site that has a PR of 5, some of that PR be will transfered from their website to your website page they linked to. These links are called backlinks.Sites with high PageRank will get crawled by the search engine bots more often, and the crawls will be deeper.

While Google takes into consideration the PageRank of your site, high PR doesn’t always equate to a higher Search Engine Results Position (SERP). You can have high PR and have a low SERP on a certian keyword phrase, while some other site can have low PR but have a high SERP on the same keyword phrase.
Below is the nice article which will help you more ,
References :
http://www.ezdia.com/Improve_Page_Rank/Content.do?id=980

You can’t just get any old backlinks. You need ones related to your site topic. Why? Google wants to make sure that web surfers like you and me get the best quality search results.

Think of it from a web-surfing standpoint. You Google the term "vampires" and get to a vampire site. You click on a link that says "vampire movies". You end up on someone’s Twilight Blog. Then you click on a link about Stephanie Meyer and all of a sudden you’re led to "Discount Baby Clothes 50% off".

You’re like, "What? How did I end up here?"

Believe it or not, there are people who actually do this just to get more traffic and increase their backlinks. Google says, "Uh…no." And they discredit the backlink because it’s not relevant to the theme of the Baby clothes.

So think about this when you’re trying to gain backlinks. What sites or blogs you can leave useful comments - don’t spam the blogs or else they’ll stick a no follow code up to keep you from getting credit - that can get your backlinks to your site. The more you have, the more Google considers you an authority and up goes your page rank.

It always helps to rub elbows with higher ranked sites. Why do you think most marketers put their articles on Ezine Articles? It’s the highest ranking article directory on the internet today. Google ranks it well; therefore, your article with a link to your website will rank highly for a particular keyword, too.
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Second thing is you need to improve links of your website by doing link building, article submissions, blog posting, blog comments, social bookmarking etc.

I am also doing SEO on one of my company website and have got a good page rank by applying all the above mentioned techniques.

http://funfilms.in/
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Check out http://seriousmonkey.ca to get better tips on my Blog Good Luck!
References :
http://seriousmonkey.ca