Alongside the firewall discussed in the last slide, Windows Defender is the other half of Microsoft's essential defensive measures, and it focuses on keeping viruses off your PC by detecting malware and purging any infections present.
Activating Defender is simple: you'll find it under Settings > Update & Security, and then click on Windows Defender. It's a must that real-time protection should be turned on to allow Windows to constantly monitor for anything suspicious and step in should a detection occur. That said, even if it's been turned off, this is such a vital piece of the puzzle that the OS will turn it back on automatically after a while.
Note that if you have a third-party antivirus application installed, Windows Defender will be turned off so as to avoid conflicts. While much criticised in the past, Defender is actually a solid enough security solution these days, and is very nicely streamlined (plus it won't bother you with any pop-ups like some of the free antivirus programs do). On the other hand, we should note that it still doesn't score up there with the best rated antivirus packages (even the free ones).
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