Frequency capping sets a maximum number of ad exposures to the same person over a period. It can broaden reach and reduce repeated exposure.
The demo receives successive impression requests and stops delivery at the chosen cap. It does not imply one cap is optimal for every campaign.
Identity coverage, measurement period, placement, and campaign goal all change the right limit. Review reach and outcomes together.
When to use
Use it when repeat exposure is high, then tune the cap against reach and outcomes.