A Google Penalty is a negative effect on your sites ranking based on updates that are made within Google’s search algorithms. A Google Penalty can also be assessed through manual review of your web page. This penalty is usually caused by your website not being up to date with the latest changes through Google search. This penalty is also used to effect those sites that are using black hat seo techniques such as link bombing and spamming. You can use the Backlink Audit tool to disavow any of these backlinks that you suspect could potentially cause a Google Penalty.