What is PMAX?
Performance Max (PMAX) is a Google Ads campaign type that runs across Search, Shopping, YouTube, Display and Gmail at once.
Google automatically decides where to show ads based on your goals and assets.
It can work well for e-shops with good product feeds and correct conversion tracking, but offers less control and insight.
Example
An e-shop runs one PMAX campaign with its product feed instead of separate Shopping and Display campaigns.