We get a ton of questions regarding what exactly is Facebook ad optimization. Facebook ad optimization is the process that makes your ad work better over a certain period of time. So the more time an ad optimizes, the more it gets better essentially.
The question that might be keep you awake at night is:
“What objective should I optimize for?”
To answer that question you need to understand how the optimization works. There are two optimizations that occur, the optimization on the pixel level ( your Facebook ad account data history), and the optimization on the ad set level of the ad you are running.