Win rate is a metric that is used in digital advertising to measure the performance, the efficiency, or the effectiveness of an advertiser, a publisher, or an ad network, in terms of the number, the value, or the proportion of the ad impressions, the ad clicks, or the ad conversions that are won or acquired by the advertiser, the publisher, or the ad network, compared to the total number, the total value, or the total proportion of the ad impressions, the ad clicks, or the ad conversions that are available, that are eligible, or that are competing in a specific ad auction, ad campaign, or ad marketplace. Win rate is often used in combination with other metrics, such as the bid rate, the impression share, the click-through rate, or the conversion rate, in order to provide a more comprehensive, more detailed, and more accurate understanding of the performance, the efficiency, or the effectiveness of the advertiser, the publisher, or the ad network, in terms of the ad revenue, the ad fill rate, or the ad viewability.