Qubes uses virtual machines to let you manage separate “security domains”. A virtual machine (VM) is basically a tiny operating system running inside of your real operating system. If your VM gets hacked, the attacker is able to access the files and read keystrokes in that VM, but not in other VMs or on your host computer. In Qubes all software (besides the desktop environment) is running inside of VMs, and you can easily and efficiently make as many as you need for whatever purposes you need. It’s also designed in such a way that if one VM gets infected with malware, the malware won’t be there the next time you reboot that VM.
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