CTR, which stands for "Click Through Rate," is a metric used to determine how effective an internet advertisement is. This statistic aids marketers in evaluating the efficacy of their advertising strategies. It can be used to measure the success of a campaign and provide insights on what adjustments need to be made in order to increase the effectiveness of a campaign.

Through CTR, it becomes easier to identify which campaigns are performing better and attracting the user's attention. In this way, it is possible to have a perception of which strategies work and which ones need improvement.

CTR is the number of clicks received by an ad or set of keywords in relation to the number of views. By dividing the total number of clicks on an advertisement by the total number of impressions it has gotten, it is determined. 

The Click Through Rate can be calculated as follows:

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CTR is a key metric to optimize the marketing budget allocation.