Defender will continue to provide security even for unsupported Windows 10 PCs. But Microsoft still wants you to move to Windows 11.

Microsoft says the ESU program is "not intended as a long-term solution but rather as a temporary bridge to stay secure while one migrates to a newer, supported platform."  Windows security ...

Windows 10 ends non-security support today; however, ESU (Extended Security Updates) continues to provide security updates for enrolled users. Microsoft Defender will maintain detection and protection ...