YUM is a package manager (an installer and remover) for RPM systems. It is tailor made to update groups of machines without having to update each specific RPM. The software locates and obtains the correct RPM packages from repositories, freeing you from having to manually find and install new applications and/or updates. The beauty of YUM is in its simplicity. You can use a single command to update all system software.
The Oracle public yum server offers a free and convenient way to install packages from the Enterprise Linux and Oracle VM installation media via a YAM client. This is now even possible without an Unbreakable Linux Network (ULN) account.
For more information see: Oracle Enterpise Linux – public YUM Server – Oracle validated RPM