Link building helps Web sites gain popularity and improve page ranking (PR). Link popularity, however, is a complex concept and one of the most debatable topics in Internet marketing. This is because different search engines follow different types of algorithms to evaluate a Web site based on the number and quality of incoming links. To add the woes, major search engines like Google follow a sophisticated ranking process, which the company claims, can identify unethical practices of link building, also known as link farming.

