What is actual CPC AdWords?

Your actual cost-per-click (actual CPC) is the final amount you’re charged for a click. … Actual CPC is often less than max. CPC because with the Google Ads auction, you only pay what’s minimally required to clear the Ad Rank thresholds and beat the Ad Rank of the competitor immediately below you.

For More Information Please Refer: https://support.google.com/google-ads/answer/6297?hl=en