Ad metrics are measurements used to evaluate the performance of advertising campaigns. They help marketers understand how well their ads are reaching and engaging their target audience. Common ad metrics include click-through rate (CTR), conversion rate, and return on ad spend (ROAS). These metrics provide insights into the effectiveness of different advertising strategies. By analyzing ad metrics, businesses can make informed decisions about where to allocate their advertising budget. This data-driven approach allows them to optimize their campaigns for better results, ensuring that they reach potential customers more effectively and efficiently.