Key Performance Indicators (KPIs) are essential for a PPV ad traffic manager to measure campaign success and optimize performance. Top KPIs include Cost Per View (CPV), which tracks the expense of each ad impression, and Click-Through Rate (CTR), measuring how often viewers engage with the ad. Conversion Rate is crucial, indicating how effectively views turn into actions, such as leads or sales. Return on Ad Spend (ROAS) assesses profitability, while Bounce Rate helps evaluate landing page relevance. Monitoring Traffic Quality, including time on site and pages per visit, reveals user engagement. Effective use of these KPIs enables data-driven adjustments, better targeting, and improved ROI, ensuring PPV campaigns deliver both reach and measurable business impact.