Inbound links are one of the most important factors that Google uses to determine the position of a website in the search results. Some years ago, it was sufficient to get a lot of inbound links to top Google’s search results. Nowadays, it’s not that easy. Google has started to detect unnatural linking patterns.
Unnatural linking is linking that wouldn’t happen if search engines didn’t exist. Unnatural links are links that are built purely to increase the search engine rankings of a website. These links don’t have topical relevancy.
If you wonder, visit my blog and read this article about unnatural linking...