YUM

YUM stands for Yellow Dog U'pdater, m'''odified and is an automatic updater and package installer/remover for rpm systems. It is the default package management system on RedHat based systems, like (originally) Yellow Dog Linux and Fedora. YUM is to RedHat what apt is to Debian.

YUM Project Homepage

YUM: Setup and Usage

Yum Wiki Pages

Creating a Redhat Yum Repository

Upgrading Red Hat Linux/Fedora Core with yum