Click-Through Rate (CTR) is a crucial metric in digital marketing and advertising that measures the effectiveness of a specific online campaign, typically displayed as a percentage. It calculates the ratio of users who click on a particular link, advertisement, or call-to-action (CTA) to the total number of users who viewed the same content. A higher CTR indicates that a larger percentage of users were engaged and found the content compelling, making it a vital metric for assessing ad and content performance. Marketers use CTR to gauge the success of campaigns, refine strategies, and optimize content to maximize user engagement and conversions.