Windows 10 has built-in real-time antivirus, just as
Windows 8 did. It automatically runs in the background, ensuring all Windows users have a baseline level of antivirus protection. Windows 10 won’t complain at you to install an
antivirus, as Windows 7 did.
If you’ve used Microsoft Security Essentials on Windows 7 or previous versions of Windows, this is the same basic product. It was renamed to “Windows Defender” in Windows 8 and integrated into Windows itself.
Automatic Scans and Updates
Like other anti-malware applications, Windows Defender automatically runs in the background, scanning files when they’re accessed and before you open them.