CTR
CTR measures how often people click on your search result when they see it. You calculate it by dividing clicks by impressions - if your page shows up 100 times and gets 5 clicks, your CTR is 5%. CTR varies greatly by position, with top results typically getting much higher click rates than lower positions.
Your search result appearance affects CTR, though Google mostly decides their own SERP listing using data from your page. Meta Tags work directly in other search engines, directories, and feeds, but Google may choose different text for display. Writing your entire page well gives Google better options to create compelling search results. Featured Snippets and other SERP Features can boost or reduce your CTR depending on how they change the search results layout.
CTR serves as one of several User Signals that may influence search rankings. Higher CTR can indicate that your result better matches user intent compared to other results at similar positions. You can track CTR changes through Position Tracking tools to see how content and display changes affect click behavior over time.