Recent versions of Windows come equipped with a built-in security software called Windows Defender. It provides protection comparable to paid antivirus and anti-malware solutions and is well-rated by independent testing organizations. Should you choose to use it, we recommend taking a few minutes to configure some of its additional security features.  

For other current Windows security software comparisons and recommendations, please refer to the following websites: 

• The best antivirus software for Windows home users  
• Best antivirus software based on independent testing of free and paid solutions   

While Apple's recent macOS releases provide a baseline level of protection through their built-in security software, including XProtect and Gatekeeper, they don’t catch everything, and you don’t have much control over how they work. You should therefore consider employing an additional security software solution to benefit from more comprehensive protection and the identification and containment of Windows-based malware. (Although Windows-based malware won't impact your macOS device, it can be transmitted to Windows users and cause them serious harm.)

For current macOS security software comparisons, please refer to the following website: 

• The best antivirus software for macOS home users  

After Windows, Android is the most popular operating system when it comes to developing and releasing malware and PUA. 

For current Android security software comparisons, please refer to the following website: 

• The best antivirus software for Android users