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If you're unfamiliar with virtualization computer terms, it's a good idea to read through the first several pages of Chapter 22, “Exploring the Virtualization Environment.” If you'd like a quick jump start instead, a few basic definitions were covered in Chapter 2.

You may perform the CentOS installation on a physical system, or you may install it as a virtual machine on a host system. Thus, in the next few sections, we'll look at the hardware requirements needed for installing the CentOS distribution directly on a physical server and for installing it within a virtualized environment.