Campaign, Ad Group, Ad

Google Ads is built in three levels: the campaign sets the budget, the type, and the big settings; the ad group holds a tight theme of keywords and the ads for them; the ad is what the person actually sees.

It looks like a maze of nested boxes, so picture three floors instead. The campaign is the top floor, and it decides the budget, the campaign type such as Search or Performance Max, the locations, and the bidding. Inside it sit ad groups, and each ad group is meant to be one tight theme, a small set of closely related keywords plus the ads that answer them. Inside each ad group sit the ads themselves. On Search, your keywords also live at the ad group level, which is exactly why the ad group is the floor you most need to get right.

This structure matters because it decides how well Google can match the right ad to the right search, and how cleanly you can read your own results afterward. Cram unrelated keywords into one ad group and no single ad can speak to any of them well, so your relevance drops and your costs climb. Split them into tight, themed ad groups and each ad can answer its searches closely, which lifts quality and lowers what you pay.

The newer campaign types hide most of this structure, and that catches people out. Performance Max especially has no keywords and ad groups to tune the same way; you feed it assets and audience signals and Google assembles the rest behind a curtain. So this clean three-level model really describes the Search world, and a big part of learning Google in 2026 is knowing which campaign types still hand you these levers and which quietly take them away.

On Search you build the three floors yourself; on the automated types, Google builds them and does not show you the blueprint.