The CTR curve shows the percentage of people that click on a search result, for the top 10 searches. A position 1 may have 25% of searchers click on it, while for position 10 only 1% might click.
A CTR curve is different for every website. The CTR curve helps to identify specific pages that have a lower CTR vs. the rest of website. Changing the meta description or page title might increase the CTR.Back