Conversion Optimizer allows advertisers to bid on a CPA (cost-per-acquisition) basis. By using Conversion Optimizer, advertisers are not only seeing an increase in profits but have more time to devote to the rest of their business. Google is reporting that Conversion Optimizer’s a hit among advertisers. Using second quarter data, the AdWords tool is on track to manage $1 billion of paid search ad spend annually. This new shift benefits two areas Google cares deeply about: showing our users the most relevant ads and helping our advertisers increase their profits.