What does CTR mean?
CTR stands for click-through rate: the percentage of people who click a result after seeing it. It's calculated by dividing the number of clicks by the number of impressions and multiplying the result by one hundred. If a result shows up 1,000 times and gets 50 clicks, the CTR is 5%. That math stays the same in every channel; what counts as a click and an impression there is what changes.
The metric shows up in different contexts with the same formula but different readings. In web analytics and organic search, Google Search Console calculates it by page, query or country from the results that actually appeared in the search engine. In Google Ads it measures a paid ad's performance. In email marketing, it's the share of opens that turn into a click on a link, and in social media ads, the interaction with a sponsored post. This article focuses on organic CTR, the one technical SEO works with day to day.
