Definition: Click-Through Rate (CTR) is a metric used to measure the effectiveness of an online advertising campaign or email marketing effort. It is calculated by dividing the number of clicks an advertisement or link receives by the number of times it is shown (impressions), expressed as a percentage. A higher CTR indicates a more engaging ad or email content.Importance: CTR is a crucial indicator of how well an ad or email campaign resonates with its audience. It provides insights into the relevance and appeal of the content, helping marketers evaluate and optimize their strategies. A high CTR suggests that the target audience finds the content compelling, while a low CTR may indicate the need for adjustments in messaging, targeting, or design.Applications: CTR is commonly used in various digital marketing channels, including search engine marketing (SEM), display advertising, social media marketing, and email marketing. Marketers use it to assess the performance of keywords, ad copy, and creative assets, and to determine the return on investment (ROI) of their campaigns. By analyzing CTR alongside other metrics, marketers can refine their approach to drive better results. 
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