ATP(Advanced Threat Protection is now included across all Office 365/Microsoft 365 suites with Exchange Online. Previously ATP was only available on Enterprise and now Business/Enterprise plans all get the benefit of new defense tools.
Gradually rolling out in 2019.
With Advanced Threat Protection your emails/files get deeper protection integration which helps to protect you, your team and devices. Threats are becoming very common and staying ahead is directly related to your business productivity. If your device becomes infected this can take allot of your business to recover, this is why ATP is now included by default and can be accessed within the Microsoft 365 Admin Portal here.