CentOS operating system is a clone of RHEL ( Red Hat Enterprise Linux ) OS. The users of these Linux distributions are those who require system stability for as long as possible. CentOs therefore has this as its chief selling point. The release of tested, stable versions of the software. CentOS has YUM as the package manager, for all the default applications that ship with the OS. They come in thier stable versions and its not recommended to try to work around them.