Measuring the success of PPC campaigns involves tracking key performance indicators (KPIs). Focus on metrics like click-through rate (CTR), conversion rate, cost per click (CPC), and return on ad spend (ROAS). CTR indicates the effectiveness of ad copy, while conversion rate measures the percentage of users who take the desired action. CPC helps assess the cost-effectiveness of your ads, and ROAS provides insights into the overall profitability of the campaign. Regularly analyzing these KPIs allows businesses to optimize their PPC strategy, allocate budgets effectively, and achieve better results from their advertising efforts.