Window Defender will now be defending MacOS too

Windows Defender ATP will be called Microsoft Defender ATP on non-Windows platforms. — Microsoft

Microsoft has announced that they are bringing Windows Defender Advanced Threat Protection (ATP) enterprise software to non-Windows platforms under the name Microsoft Defender ATP, with MacOS as the first platform it is being brought to.

"As we bring our unified security solution to other platforms, we’re also updating our name to reflect the breadth of this expanded coverage: Microsoft Defender ATP," said the Microsoft community announcement post.