Glossary
Smart Bidding
Smart Bidding is Google Ads' suite of automated bid strategies that use machine learning to optimize bids in real time for each individual auction. Rather than applying a single bid across all traffic, Smart Bidding evaluates dozens of contextual signals — including device, location, time of day, browser, operating system, and audience list membership — to set the bid most likely to achieve the advertiser's stated goal. The four core Smart Bidding strategies are Target CPA (optimizes bids to hit a target cost per acquisition), Target ROAS (optimizes for a target return on ad spend), Maximize Conversions (drives the most conversions within a given budget), and Maximize Conversion Value (maximizes total conversion value within budget). Smart Bidding powers both Search and Display campaigns and underpins Performance Max. Because the algorithms are conversion-trained, Smart Bidding requires a minimum volume of conversion data — if an account lacks sufficient history, starting with Maximize Clicks and graduating to Target CPA once conversion data accumulates is a standard launch sequence. Smart Bidding represents a fundamental shift from manual bid management to algorithmic portfolio optimization, and has become the dominant bidding paradigm across Google Ads.