Virtualization allows you to run several "seeming-as-if" (virtual) computers on one computer. This can help you

to work in several isolated VPN environments on one computer
to test several Linux distributions running at the same time on one computer
for developers, to test "dangerous" changes like on the login manager or the boot sector
in big companies, to take best use out of your computing resources

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Such a deep ansewr! GD&RVVF

Anonymous