What is click-through rate (CTR) most closely associated with?

Click-through rate (CTR) is a key metric in online advertising that measures the effectiveness of an ad campaign in engaging viewers. It specifically represents the percentage of individuals who click on an advertisement after it has been displayed to them. This is calculated by taking the number of clicks an ad receives and dividing it by the number of times the ad is shown (impressions), then multiplying by 100 to get a percentage.

This metric is crucial because it indicates how well an ad captures attention and encourages viewers to take action. A high CTR suggests that the ad is relevant and interesting to the audience, while a low CTR may signal the need for improvements in targeting, messaging, or creative content.

The other potential answers relate to different aspects of advertising but do not directly define CTR. The display count measures visibility, cost relates to the budget and resources spent, and the duration of an ad’s activity involves time management rather than engagement effectiveness. Thus, the definition provided in the correct option accurately captures the essence of click-through rate.