As Online ads are becoming ubiquitous, click-through rates have fallen over time as people get used to disregarding them. CTRs of just 1 or 2 users per thousand are actually frequent.
abbreviation for click-through https://medium.com/@adriana.lima.93/faster-than-seo-3-easy-tips-to-supercharge-your-search-results-with-organic-traffic-ba71891d34dd