A delivery metric, not a viewability metric. OTS tells you the ad was in a position where it could have been seen. It does not tell you whether anyone looked at it, processed it, or registered it. Useful as a reach planning input. Less useful as a campaign performance measure. The gap between OTS and actual attention is where a lot of media value disappears.
Ad tech glossary
OTS (Opportunity to See)
Technical definition
A metric that estimates the potential for an ad to be seen by the target audience, based on placement and delivery parameters.
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