Link building is an essential factor of SEO. If you’ve used the internet then you most likely have clicked on a hyperlink that takes you to another website. These are referred to as backlinks, so in simple terms they are like votes for your website. Basically, you want more votes, because it’s somewhat of a popularity contest. Like every popularity contest, the person endorsing you matters too! Having backlinks from spam web sites, and web sites not related to your industry can have a negative to neutral effect. For example, a dental website receiving a backlink from a pavement contractor doesn’t pass as much of a vote as another dental website would. Make sense?