https://www.microsoft.com/en-us/microsoft-365/blog/2022/06/1...
Windows Defender aka Windows Security:
https://support.microsoft.com/en-us/windows/stay-protected-w...
Microsoft Defender XDR (completely different thing, previously known as Microsoft Defender for 365):
https://www.microsoft.com/en-us/security/business/siem-and-x...
Microsoft Defender for Endpoint (also a different thing, basically XDR lite):
https://www.microsoft.com/en-us/security/business/endpoint-s...