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Chroot is a "jail" in which a new process is started in some sub-directory -- that process is unable to change directory higher out of that sub-directory. Basically chroot helps to protect the rest of the system -- i.e. you create a sub-directory with all the necessary stuff to support the executables you need plus any data files you want to offer as well, then it is all locked down and anyone using that service is unable to get out and mess with the rest of your system and other data files.