Detailed definition
With PMax you supply the assets (images, video, headlines, descriptions), the audience signals and the conversion goal, and Google's AI optimises which asset is shown where. The advantage: broad reach and automated optimisation. The disadvantage: you cannot see fully which channel the budget went to. In most accounts, keeping brand searches in a separate Search campaign and using PMax for generic demand makes control easier.
Examples
- In e-commerce, PMax combined with a product feed reaches a scale comparable to Shopping ads.