Office 365 Advanced Threat Protection (ATP) is one of the recent offerings rolled into Microsoft 365 Business. See:
Microsoft 365 Business new feature comparison
I feel that ATP should be a mandatory add on for all Office 365 SKUs that don’t already include it. It is very cheap but really helps protect users from bad stuff coming in via emails.
One thing that many people fail to realise about ATP (and many other O365 security features in fact) is that you need to enable it or set up policies to control what you want the service to do. These generally aren’t there by default, so simply adding a license isn’t good enough. You actually need to go in and configure the policies.
The above video gives you and overview of how to set these policies and what options they involve. You’ll also see ATP in action protecting a mailbox from malware. This should give you a goo introduction to Office 365 ATP.
Learn how ATP will make you and your business safer.