Click-Through Rate (CTR) is a key performance metric for search engine optimisation (SEO) that measures the effectiveness of a search result in generating user engagement. CTR is calculated by dividing the number of clicks on a particular link by the total number of times it was displayed (impressions), then multiplying this figure by 100 to express it as a percentage.
An example of this is, if an search result receives 5 clicks out of 1000 impressions, its CTR would be calculated as (5/1000) x 100 = 0.5%. A higher CTR indicates that more users are finding the content relevant and compelling enough to click through, which can signal quality to search engines and potentially improve rankings.