Pagerank is how Google - search engine - give a rank to your site. It gives ranking based on your quality backlink. So to increase pagerank of your site, you need to get as much as possible quality backlinks to your site.

Alexarank is how Alexa give a rank to your site based on your unique visitor number. The lower the alexarank of the site so it means that the site have more unique visitors.

Backlink is a link from other site to your site. A quality backlink is when your site got a link from other site which its content is relevant with your content. You can get quality backlink by submit your site to directory with relevant category or post an article or post a good comment in a blog that its content relevant to your content.

If you want to get higher rank specially in Google search engine or you want to increase pagerank of your site, then you would consider these three factors to your search engine ranking or your Search Engine Optimation effort. Alexarank, pagerank and backlink. Always use at least these three as parameters to evaluate your search engine optimation efforts.

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