Signal quality
Signal quality is the fitness of your conversion data as an input to automated bidding: complete, deduplicated, on time, and carrying real values.

Signal quality is the fitness of your conversion data as an input to automated systems: whether the conversions your ad platforms receive are complete, deduplicated, on time, and carrying real values. High signal quality means Smart Bidding and Advantage+ optimize toward your revenue; low signal quality means they optimize toward noise, just as efficiently.
#Signal quality is not "data quality"
Data quality is warehouse hygiene: is the table accurate. Signal quality is narrower and higher-stakes: is the conversion stream the bidding algorithm eats trustworthy. A conversion feed can pass every data-quality check and still fail on signal quality in four ways: broken (events never arrive), duplicated (pixel and CAPI both counted), late (CRM imports landing days after the click), and value-less (a $99 signup weighted equal to a $50k contract). Each defect produces a different mis-spend pattern, because platforms don't pause on bad data. They act on it.
Signal quality is what Buron monitors continuously (event coverage, dedup, import recency, value presence), so a decaying signal becomes a finding instead of a bad quarter.
Why it's the constraint that outranks the others: The tracking bottleneck. The full argument, defect by defect: The tracking bottleneck: your bids are only as good as your signal.
Related terms
Smart Bidding
Smart Bidding is Google Ads' auction-time automated bidding (Target CPA, Target ROAS, Maximize conversions, Maximize conversion value), setting a bid per auction from the conversion data you feed it.
The tracking bottleneck
The tracking bottleneck is the point where conversion signal quality caps everything downstream: bidding, attribution, and MMM can't be better than the data they're fed.
Value-based bidding
Value-based bidding is automated bidding that optimizes toward conversion value instead of conversion count (tROAS and Maximize conversion value on Google Ads), and it's only as good as the values you feed it.