Windows Defender has several security settings, including some you need to switch on to get the utmost protection. Here's why.

If Smart App Control (SAC) settings are greyed out in Windows 11 Security, update Windows, or enable SAC in the Windows ...

Windows Defender is a capable antivirus solution built into Windows itself. Unless you’ve installed a different antivirus program on your Windows 11 or Windows 10 PC, your PC is using it right now.