Excerpt: "With jail it is possible to create various virtual machines, each having its own set of utilities installed and its own configuration. This makes it

Excerpt: "With jail it is possible to create various virtual machines, each having its own set of utilities installed and its own configuration. This makes it a safe way to try out software. For example, it is possible to run different versions or try different configurations of a web server package in different jails. And since the jail is limited to a narrow scope, the effects of a misconfiguration or mistake (even if done by the in-jail superuser) does not jeopardize the rest of the system's integrity. Since nothing has actually been modified outside of the jail, "changes" can be discarded by deleting the jail's copy of the directory tree."