Windows Defender Advanced Threat Protection (ATP) * (Post breach) now also supports macOS, Linux, iOS and Android devices.
For details:
Microsoft partners extend Windows Defender ATP across platforms
https://blogs.windows.com/business/2017/11/08/microsoft-partners-extend-windows-defender-atp-across-platforms/#fkArlTUBziOplC1V.97
Yong
More information:
*a part of the Windows Defender Suite and not to be confused with Windows Defender Antivirus.
What makes a part of the Windows Defender Suite?
Pre-breach
Windows Defender Antivirus (SCEP and Security Essentials replacement)
Windows Defender SmartScreen
Windows Defender Application Guard
Windows Defender Exploit Guard (EMET replacement)
Post-breach
Windows Defender Advanced Threat Protection