The search engine ranking gives higher rank to that website which has generated a maximum number of traffic. If the website is placed in first ten pages of the search engine that it would be searched in by persons those who look for specific information. The websites that are placed in pages after ten would not be looked often by the readers as there would not be any necessity to go for more pages if they get the required information in the first few pages. So all the websites wish to place their sites in the first few pages of the search engine. This could be done by creating a link wheel that brings hundreds of backlinks to your sites.
They would use many stratagems to get linkwheel for your website, which would include social book marking, forum posting and directory submissions, but the most significant modes to gain backlinks are posting blogs, commenting in blogs, submitting unique content articles to article directories and to create bloggers in web 2.0 sites. Article containing target keywords would also contain two links of which one would point to the target website and the other to the micro site created in consequence to the keyword.