Virtualization is valuable to service providers wishing to offer their users the ability to have custom configurations and yet keep the overall system easy to maintain. For example, two different customers could need different versions of the same software. Without jails, configuring multiple software versions in different directories and ensuring they do not encroach on each other isn't always possible or easy to maintain (. XFree86 is notoriously hard to move around). Jails on the other hand permit software packages to view the system egoistically, as if each package had the machine to itself. Jails can also have their own, independent, jailed superusers.
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