What are they?
Blackout Dates is an advanced feature that is not required. It is used to exclude days and data from AdRules memory. Every system has problems with data from time to time. For example, perhaps your back end system has issues, or perhaps it is your mobile measurement partner or even Facebook, Apple or Google. Blackout dates allow you to poke a hole in the data and remove entire days from AdRules memory. This allows you to quickly get Ad Sets back on and bidding correctly when there are system issues.