For as long as PPC advertising has been around there have been those looking to exploit the system in an effort to put their competitors out of business. Most are aware of click fraud, the most prevalent form of PPC fraud, but there are many other types of fraudulent attacks that you must know about as an advertiser. Don’t think for a second that these exploits are rare and cannot happen to you or the campaign you are managing. These harmful events have become part of the digital advertising ecosystem and some marketers are already “baking” fraud into their ROI (not a great way to deal with fraud). Follow this guide to learn about the other forms of PPC fraud and how to combat them.