Operating principles of Microsoft Azure Stack

I dont still understand the concept of Anti-Phishing in this video. Video says Anti-Phishing concept says it will help to prevent compromised accounts and Domains.
But how it will work ? do we need to add compromised accounts/Domains by creating new policy under Anti-Phishing.
or I it will prevent the accounts for getting compromised ?
Your advise will be much appreciated.
Thank you
Shivappa Hosamani