Many users will not even notice that Defender is working until they're subjected to an attack.

Windows Defender: Antivirus protectionĮven if you do nothing to a new Windows 8.1 or 10 computer, Windows Defender is already there protecting your machine. Hence the official renaming of the enterprise product to 'Microsoft Defender.' Microsoft tells us the consumer product will continue to be called Windows Defender Antivirus. There's already a beta version of Microsoft Defender for Macs in enterprise deployments, and Microsoft says it is working on Microsoft Defender for Android and Linux. Microsoft plans to expand Defender's coverage to other platforms. On the other hand, it still lacks things that third-party antivirus makers add as enticements, such as a file shredder and VPN access. But if you take into account the entire Windows Security apparatus, Defender comes with a firewall, drive-level encryption (in Windows 10 Pro and up), limited parental controls and even a game mode. There are no upgrades available to augment protection or add features. What you see with Windows Defender is what you get. Windows Defender comes with Windows 8.1 and 10 and can be disabled only by the installation of a third-party antivirus program, or, if you're brave, editing the Windows Registry. Windows Defender: What's covered and upgrade options

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