Ad fraud refers to any type of deceptive activity that aims to generate revenue through the exploitation of advertising systems. This can include methods such as click fraud, impression fraud, and ad stacking. The phenomenon has profound effects on advertisers and publishers alike, leading to wasted budgets, decreased ROI, and distorted analytics. In this guide, we delve into the various types of ad fraud, reveal how they operate, and suggest best practices for safeguarding against these unlawful activities.