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Data clean room
A locked room where two companies can compare notes on their data without either one handing over the raw list.
Example
A retailer and a media platform both hold customer emails. A clean room can tell them how much their two lists overlap and how those shared customers behaved — without either company ever seeing the other's raw data.
Why marketers care
It's becoming one of the main ways brands and platforms collaborate on data as third-party cookies and broad data sharing get restricted — you get the analysis without the privacy exposure.