What is the difference between deterministic and probabilistic identity matching in digital advertising?

Question

Digital Marketing — Hard

What is the difference between deterministic and probabilistic identity matching in digital advertising?

Accepted Answer

Deterministic identity matching relies on confirmed identifiers for high-accuracy linking of user activity across devices, but has limited scale. In contrast, probabilistic matching uses statistical modeling for greater reach, albeit with lower accuracy. This distinction is crucial for digital advertisers. The correct answer highlights this trade-off.