Admob CTR (click-through rate) is a metric that measures the percentage of users who click on an ad after it is displayed to them. It is calculated using the following formula:

CTR = (Number of clicks / Number of ad impressions) x 100

For example, if an ad is shown to 100 users and it is clicked on 10 times, the CTR would be calculated as follows:

CTR = (10 / 100) x 100 = 10%

CTR is an important metric for app developers to consider when monetizing their apps through advertising, as it indicates the effectiveness of the ads in terms of generating clicks and revenue. A high CTR is typically seen as a positive sign, as it indicates that the ads are engaging and relevant to users. However, it is important to strike a balance between maximizing CTR and maintaining a good user experience, as users may become frustrated if they are shown too many ads or if the ads are not relevant to their interests.