One of the main features that distinguishes Red Hat Linux 6 from other versions of Linux that incorporate the Linux 2.2 kernel is the inclusion of Red Hat Package Manager (RPM).
Red Hat has developed RPM as a standardized way to distribute, install, and upgrade Linux software, or packages.
GnoRPM is the version of RPM that runs under the Gnome desktop environment. If you plan to install any programs that were not installed with the original CD, or to upgrade any programs, you will be using GnoRPM.
An available package is a package that is ready to be installed. Availability of a package does not mean that the package has been installed. Also, the package file is different from the binary it contains, which may have its own installation ...