Click-through rate (CTR) is a metric used to measure the effectiveness of an online advertisement or link. It represents the percentage of people who click on an ad or link compared to the number of times it was shown, or its "impressions." The formula for calculating CTR is the number of clicks divided by the number of impressions, then multiplied by 100 to get the percentage. A higher CTR indicates that the ad is more engaging and encourages people to take action, while a lower CTR suggests the ad may need improvement.

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