Anti-phishing with Office 365 Advanced Threat Protection

The Discussion

• 

  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