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What is conversion optimizer in Google AdWords?

AdWords Conversion Optimizer is a tool that helps acquire the most conversions possible at a defined target cost per acquisition. Instead of manually manipulating bids and generating conversions at any cost, conversion optimizer automatically adjusts bids so conversions are generated within a defined CPA boundary.

The Conversion Optimizer is an AdWords feature that predicts which clicks are likely to be profitable in accordance to your goals. It then adjusts your bids to help you get as many profitable clicks as possible.