What is a walled garden in advertising?
A walled garden is a closed advertising ecosystem, such as Google, Meta, or Amazon, where the platform controls the data, inventory, and measurement. Advertisers can reach large audiences but get limited access to the underlying data.
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How walled gardens work
The platform owns the audience and the data about it. Advertisers buy through the platform's own tools and see the results in the platform's own reports.
This gives advertisers strong targeting inside the platform, because the platform knows a lot about its users.
The tradeoffs
Advertisers often can't move user-level data out, and must trust the platform's own measurement. That makes it harder to compare results across platforms or to check them independently.
It also means moving between platforms means rebuilding audiences and learning new tools.
Managing walled gardens
Use consistent tracking on your own site and compare platform-reported results with your analytics. Consider independent tests, such as holdouts, to check what each platform adds.
Common questions
Which companies are walled gardens?
Large platforms that control their own audience, data, and advertising tools, such as Google, Meta, and Amazon, are commonly described this way.
What is the opposite of a walled garden?
The open web, where many independent publishers sell ad space through exchanges and programmatic platforms. Buyers have more choice of data and measurement vendors there.
Why do advertisers use walled gardens?
They offer large audiences, detailed targeting, and easy buying in one place. Many advertisers combine them with open web buying.
Is a walled garden good or bad?
It's a tradeoff. You gain reach and convenience, and you give up transparency and data portability.
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