Backlinks, which are created by a process called linkbuilding, have a major influence on the position of the site in the search engines. It depends very much on the number of links, their naturalness and also thematic similarities.
Linkbuilding should aim to create only high-quality links. Referencing from a variety of unrelated sites is of no general importance, and may harm our site. The site to which the backreference is placed should be an industry relative, have a high rank and ranking in search engines.
Linkbuilding uses several methods to increase the success of the site. They are registering the site into industry catalogs, exchanging or even buying backlinks, writing PR articles, using social networking sites, blogging, discussions, and supporting WWW pages.