Quality shows as sustained engagement: repeat visits, multiple page views, conversions, and longer session durations. Short-term traffic spikes with high bounce rates, one-off sessions, and little conversion activity. Partners that steadily refer users over time score higher than those creating temporary bursts. Lead quality is validated through tracking downstream actions like sign-ups, purchases, or qualified demo requests, plus CRM matching to prevent duplicates. Attribution windows and cohort analyses reveal whether traffic turns into long-term customers.