For display ads, distinguishing real users from bots in real time comes down to reading behavior signals, not just traffic counts. Systems watch things like mouse movement, scroll depth, click timing, and how quickly pages load or actions repeat. Sudden bursts of identical clicks or perfect, inhuman timing often hint at automation. Like heatmaps for websites, request logs and interaction flows show where users hesitate or drop off, helping flag suspicious patterns. Combining device fingerprints, IP reputation, and session behavior builds a clearer picture of authenticity.