The same way everyone else does.
Software testing, running legacy programs that no longer work on modern OS’s, encapsulation to help prevent programs from interfering with others, running virtual desktops for thin/zero clients, honeypots to catch hackers, etc.
The only difference is that VM’s at home are much less common than in the work place; And that VM’s at work typically run on dedicated servers, usually through the OS called ESXi. Where as a home user will probably just run it on a normal desktop PC.
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