What is CPA in Google Ads?

Target CPA is a Google Ads Smart Bidding strategy that sets bids to help get as many conversions as possible at or below the target cost-per-action (CPA) you set. It uses advanced machine learning to automatically optimize bids and offers auction-time bidding capabilities that tailor bids for each and every auction.
For More Information Please Refer:
https://support.google.com/google-ads/answer/6268632?hl=en
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