A:Answer Windows 10 has Windows Defender.
Per the following link:
https://www.microsoft.com/en-us/windows/comprehensive-security
Windows 10 delivers comprehensive, built-in and ongoing security protections you can trust – including Windows Defender Antivirus, firewall, and more. By staying up to date, you’re assured of the latest features and protection – at no extra cost to you.
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Windows Defender Antivirus
Keep your PC safe with trusted antivirus protection built-in to Windows 10. Windows Defender Antivirus delivers comprehensive, ongoing and real-time protection against software threats like viruses, malware and spyware across email, apps, the cloud and the web.