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Qubes OS is A reasonably secure operating system for personal computers.

Qubes OS takes an approach called "security by compartmentalization,"​ which allows you to compartmentalize the various parts of your digital life into securely isolated compartments called "qubes.”​  

This approach allows you to keep the different things you do on your computer securely separated from each other in isolated qubes so that one qube getting compromised won't affect the others. For example, you might have one qube for visiting untrusted websites and a different qube for doing online banking. This way, if your untrusted browsing qube gets compromised by a malware-laden website, your online banking activities won't be at risk. Similarly, if you're concerned about malicious email attachments, Qubes can make it so that every attachment gets opened in its own single-use disposable qube. In this way, Qubes allows you to do everything on the same physical computer without having to worry about a single successful cyberattack taking down your entire digital life in one fell swoop.

Tens of thousands of users around the world, along with many companies, rely on Qubes for their security every day.

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