A signal, not a target
Unlike a traditional audience, an audience signal does not limit who sees your ads. It tells Performance Max where to start looking, and Google then explores beyond it. Feeding a strong signal, your customer list, converters, high-intent in-market audiences, speeds up learning.
Why the input quality matters
Because PMax leans on the signal early, a weak or generic one sends it exploring in the wrong places and wastes budget while it learns. Seed it with your best first-party data, the same principle as seeding a lookalike from real converters, not from all visitors.
Common questions
Does an audience signal limit who sees my PMax ads?
No. It is a starting hint for Google's model, not a targeting restriction. Performance Max will deliver beyond the signal as it learns who converts.
What makes a good audience signal?
Strong first-party data: your customer match list, recent converters, and high-intent in-market audiences. A generic signal slows learning and wastes early budget.