Google's Conversion Optimizer is a multi-dimensional bid management tool that optimizes bids across multiple factors like location, device, and content to improve campaign performance and lower costs. It analyzes over 30 factors beyond just keywords to avoid unprofitable clicks and get more conversions at a lower cost than simple bid management. Advertisers using Conversion Optimizer see an average 21% increase in conversions and 14% decrease in cost-per-acquisition. It's easy to implement and free for AdWords advertisers.