How does Google decide which ad to show?

The ad auction is how Google decides which ads to show and how they’re positioned. Google Ads calculates Ad Rank for every ad in the auction. … Your bid - When you set your bid, you’re telling Google Ads the maximum amount you’re willing to pay for a click on your ad.

For More Information Please Refer:
https://support.google.com/google-ads/answer/1722122?hl=en
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