Windows Devices

Microsoft Defender Antivirus is part of the integrated Windows Security app and provides comprehensive, real-time protection against malware, viruses, ransomware, and other threats at no extra cost. It's enabled by default, so your computer has basic protection from the start, though you can manage its settings, including virus & threat protection, through the Windows Security app. 

• Stay Protected with Windows Security 

Mac Devices

Apple computers come with built-in, free anti-malware protection, but not a traditional antivirus program in the sense you might expect on a Windows PC. macOS includes features like XProtect for detecting known malware, the Malware Removal Tool (MRT) to remove threats, and Gatekeeper to block the installation of untrusted applications, providing a strong security foundation.

Additional Notes

• Some internet service providers offer free antivirus protection, but it varies by provider; You must check with your specific ISP to see if they offer this benefit. 
• Other antivirus solutions are available for download but please investigate those claiming to be free. Many are simply trial versions to get you started. A paid subscription is required for updates and continued functionality once the trial period expires.