Click-through rate is calculated by dividing the number of clicks by the number of impressions, expressed as a percentage. In SEO, CTR typically refers to the percentage of searchers who click on your result after seeing it in the SERP. A higher CTR signals to Google that your result is relevant and compelling, which can positively influence rankings. CTR is also a key metric in email marketing, paid advertising, and any digital channel where users choose whether or not to engage with content.