Being blacklisted from the search engines is one of the worst possible things that can happen to an online business. It has been estimated that more than half of all website traffic is generated through search engines. If your site becomes blacklisted, you lose access to all of that traffic. Being blacklisted can literally bankrupt an online business. To prevent this from happening, you need to understand what being blacklisted means, what can put you at risk of being blacklisted, and how you can prevent it from happening.