The importance of building links in search engine optimization is crucial, you could have enormous quantity of quality and unique content but that is the other major factor of reaching the top of the search engines rankings.

That might sound sad, but there is no other method of telling the search engines that your website is useful because they're counting each link back to your website as plus in the ranking scheme. The robots are "thinking" that people simply link to your website because they find it useful.

SERP's (search engine ranking position) are established by a bunch of criteria, some with major importance like link popularity and unique content and some other with minor importance like website loading time, website size, meta and title tags, etc.