Inbound links are links from pages on external sites linking back to your site. Inbound links can bring new users to your site, and when the links are merit-based and freely-volunteered as an editorial choice, they’re also one of the positive signals to Google about your site’s importance. Other signals include things like our analysis of your site’s content, its relevance to a geographic location, etc. As many of you know, relevant, quality inbound links can affect your PageRank (one of many factors in our ranking algorithm). And quality links often come naturally to sites with compelling content or offering a unique service.
How do these signals factor into ranking?
Let’s say I have a site, example.com, that offers users a variety of unique website templates and design tips. One of the strongest ranking factors is my site’s content. Additionally, perhaps my site is also linked from three sources — however, one inbound link is from a spammy site. As far as Google is concerned, we want only the two quality inbound links to contribute to the PageRank signal in our ranking.