Microsoft Defender Antivirus and the Windows Security app use similarly named services for specific purposes.
The Windows Security app uses the Windows Security Service (
SecurityHealthService or
Windows Security Health Service), which in turn utilizes the Windows Security Center Service (
wscsvc) to ensure the app provides the most up-to-date information about the protection status on the endpoint, including protection offered by third-party antivirus products, Windows Defender Firewall, third-party firewalls, and other security protection.
These services do not affect the state of Microsoft Defender Antivirus. Disabling or modifying these services will not disable Microsoft Defender Antivirus, and will lead to a lowered protection state on the endpoint, even if you are using a third-party antivirus product.
Microsoft Defender Antivirus will be
disabled automatically when a third-party antivirus product is installed and kept up to date.
Disabling the Windows Security Center Service will not disable Microsoft Defender Antivirus or
Windows Defender Firewall.