Google tries to keep its search results as clean as possible. For that reason, they have a variety of spam filters in their ranking algorithm that try to remove low quality web sites.
If your web site gets caught by one of these filters, it will be very difficult to get high Google rankings. In the next few articles, we'll take a look at the 15 most common Google spam filters and we'll tell you how you can get around them.
Google relies heavily on inbound links to determine the position of a web page in the search results. To make spamming as difficult as possible, Google also have a variety of link filters to make sure that only the right links are considered.