Click-through rate (CTR) is a metric used to measure the effectiveness of online advertising and content. It is calculated by dividing the number of clicks an ad or link receives by the number of times it is shown, then multiplying by 100 to get a percentage. A higher CTR indicates that more users are engaging with the content, which can suggest that it is relevant and appealing to the audience. CTR is commonly used in digital marketing, particularly in platforms like Google Ads and social media. Marketers analyze CTR to optimize their campaigns, improve ad targeting, and enhance overall performance. Understanding CTR helps businesses gauge user interest and make informed decisions about their advertising strategies.