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Google Audience Expansion vs Optimized Targeting: The Difference Explained

Some campaigns using audience expansion are being migrated to optimized targeting. Here’s what that means for advertisers.
Advertisers have raised questions about the difference between Google’s “Audience Expansion” and “Optimized Targeting” after an email went out to some Google Ads advertisers announcing that that Video Action and Discovery campaigns using audience expansion would soon be migrated to optimized targeting.