Digital Marketing — Hard What is ad fraud (invalid traffic) in digital advertising, what are its main types, and how does it affect advertisers? A Fraudulent ad creative that misleads consumers; affects brand trust and causes regulatory fines B Fraudulent activity that generates false ad metrics without real human engagement — main types include bot traffic (automated clicks/views), click farms (low-paid humans clicking ads), domain spoofing (misrepresenting inventory), and ad stacking (invisible ads); it affects advertisers by wasting budget on non-human traffic while reporting inflated metrics, with estimates of 10-30% of digital ad spend lost to fraud C Competitor click fraud exclusively, where rivals click ads to deplete budgets; managed through IP exclusions D Misleading reporting by agencies who inflate performance metrics to retain client budgets Show explanation